Biology is the scientific study of life and living organisms. It explores the structure, function, development, behavior, and evolution of living things through various subdisciplines. The fundamental units of biology are the cell, genes, and evolution. Biology seeks to understand the mechanisms that allow living things to maintain their internal organization and adapt to environmental changes.
Introduction to Life Science and The Theories on the Origin of LifeSimple ABbieC
I. Introduction to Life Science
II. The Concept of Life
III. Characteristics of Life
IV. Theories on the Origin of Life
V. Unifying Themes in the Study of Life
El tequila es un destilado originario del municipio de Tequila en el estado de Jalisco, México. Se elabora a partir de la fermentación y destilado al igual que el mezcal, jugo extraído del agave, en particular el llamado agave azul (Agave tequilana), con denominación de origen en cinco estados de la República Mexicana (Guanajuato, Michoacán, Nayarit, Tamaulipas y por supuesto en todo el estado de Jalisco ya que en los tres primeros solo se puede producir en algunos municipios, los fronterizos a Jalisco). Es quizás la bebida más conocida y representativa de México en el mundo.
Module 7 OverviewOrigin and Classification of LifeThe origin o.docxmoirarandell
Module 7 Overview
Origin and Classification of Life
The origin of life has been of great debate for centuries. This module will outline the various ideas of how life and Earth itself developed. You will learn the evidence for multiple theories on the origin of life and the evolution of these theories based on new scientific findings.
This module will also focus upon one of the most important achievements of the science of biology: the classification of organisms and the creation of an internationally agreed upon system of nomenclature. Understanding how organisms are classified provides an important basis for any future studies in ecology.
Learning Objectives
Upon completion of this module, you should be able to:
10A
Describe the evidence used to suggest an extraterrestrial source for life on earth.
10B
State the most probable physical conditions on early Earth and the changes thought to have happened before life could exist.
10C
Differentiate between the concepts of spontaneous generation and biogenesis.
10D
Examine the chemical and physical events that must have occurred to have life originate on Earth.
10E
Describe the different hypotheses for what the first living thing might have been like.
10F
Identify the way in which organisms have caused the atmosphere of the earth to change.
10G
State the order and approximate times for major evolutionary events.
10H
Examine the endosymbiotic theory.
10I
Explain the experimental evidence for the origin of life from organic and inorganic material.
10J
Distinguish between taxonomy and phylogeny.
10K
Describe the kinds of tools used to establish phylogenetic relationships.
10L
Distinguish among viruses, viroids, and prions.
10M
Describe the scientific method for naming organisms.
11A
List and give distinguishing characteristics of the kingdoms within the Domain Eukarya.
11B
Distinguish between Bacteria and Archaea.
11C
Explain the features that differentiate organisms as microbes.
11D
List the basic characteristics of members of the Protista, Archaea, Bacteria, and Fungi.
11E
Identify the type of environments in which microorganisms live.
Module 7 Reading Assignment
Enger, E. D., Ross, F. C., & Bailey, D. B. (2012). Concepts in biology (14th ed.). New York: McGraw-Hill. Chapters 19, 20, and 21.
Optional Reading Assignment:
Chapter 22, The Plant Kingdom, and Chapter 23, The Animal Kingdom.
Origin and Classification of Life
Scientists have broken down life into domains of organisms. Scientists believe that at first life, there was first the bacteria domain. The bacteria domain was followed by the archaea domain and finally, the eucarya domain. Domain bacteria and domain archaea remain the same and have not been further broken down. Domain eucarya was further broken down into the plant kingdom, the fungi kingdom, and the animal kingdom.
Organisms live on, in, and within all types of environments. Organisms can be found from pole to pole and everywhere in between. This includ ...
This document provides an introduction to biology and classification. It discusses biology as the study of living things and outlines some key branches and characteristics of biology. The document then explains the importance of classification and outlines the historical development of classification systems. It describes the modern taxonomic units used in classification, from kingdom down to species. The five main kingdoms - Monera, Protoctista, Fungi, Plantae, and Animalia - are identified. The hierarchical relationships between taxonomic groups from kingdom to species are also summarized.
Evolution is the process of change over time through natural selection. The document summarizes key evidence and theories of evolution, including:
1. Evidence from the fossil record shows gradual changes in life forms over billions of years. Comparative anatomy and embryology also provide evidence of common descent.
2. Darwin's theory of evolution by natural selection proposed that heritable variations arise by mutation and are selected if they confer a survival or reproductive advantage. This results in adaptation and potentially speciation.
3. Modern theories incorporate genetics and show how variation arises from sexual reproduction, mutation, and recombination of genes, and how selection can change allele frequencies to drive evolution or maintain genetic equilibrium.
week66.pdfP A R T I I ITheories ofEnvironmental.docxphilipnelson29183
week6/6.pdf
P A R T I I I
Theories of
Environmental Ethics
Copyright 201 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. Due to electronic rights,
some third party content may be suppressed from the eBook and/or eChapter(s). Editorial review has deemed that any suppressed content does not materially
affect the overall learning experience. Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it.
Copyright 201 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. Due to electronic rights,
some third party content may be suppressed from the eBook and/or eChapter(s). Editorial review has deemed that any suppressed content does not materially
affect the overall learning experience. Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it.
6
Biocentric Ethics and the
Inherent Value of Life
DISCUSSION: Synthetic Biology and the Value of Life
Does life itself have inherent moral value?
Several criteria for moral standing were
examined in the previous chapter, includ-
ing sensation and being conscious. For
many observers, such attributes as sensa-
tion and consciousness themselves serve a
higher end of life, and therefore they
conclude that only life itself seems to be
plausible candidate for the inherent value
that moral standing implies. A “biocen-
tric” ethics is an approach that begins
with the inherent value of life as its
foundational principle of value.
The diversity of life on earth is amaz-
ingly complex. Biological science has been
categorizing animal and plant species
since before Aristotle began his taxonomy
of living organisms more than 2,000 years
ago. Current estimates suggest that more
than 1.4 million different species have
been scientifically categorized.1 But, these
categorized species represent only a small
percentage of the actual number of spe-
cies that exist. On the basis of research
conducted in tropical forests, some esti-
mates place the number at more than 30
or 40 million species. Biologist E. O. Wilson
estimates that invertebrate species alone
may number as many as 30 million. Each
species contains from a few members (for
example, the California condor) to many
billions of members (such as bacteria).
Each species exists in an ecological niche in
which its members interact with their
environment to maintain life. Wilson tells
of many highly specialized life-forms.
One of my favorite examples of such
specialists living in microniches are the
mites that live on the bodies of army
ants: one kind is found only on the
mandibles of the soldier caste, where it
sits and feeds from the mouth of its
host; another kind is found only on the
hind foot of the soldier caste, where it
sucks blood for a living, and so on
through various bizarre
configurations.2
125
Copyright 201 Cengage .
Of all the living things, the human body in particular has been a source of curiosity by most of us. No doubt, the field of biology, anatomy and physiology provide us a clear venue to explore and understand it.
Introduction to Life Science and The Theories on the Origin of LifeSimple ABbieC
I. Introduction to Life Science
II. The Concept of Life
III. Characteristics of Life
IV. Theories on the Origin of Life
V. Unifying Themes in the Study of Life
El tequila es un destilado originario del municipio de Tequila en el estado de Jalisco, México. Se elabora a partir de la fermentación y destilado al igual que el mezcal, jugo extraído del agave, en particular el llamado agave azul (Agave tequilana), con denominación de origen en cinco estados de la República Mexicana (Guanajuato, Michoacán, Nayarit, Tamaulipas y por supuesto en todo el estado de Jalisco ya que en los tres primeros solo se puede producir en algunos municipios, los fronterizos a Jalisco). Es quizás la bebida más conocida y representativa de México en el mundo.
Module 7 OverviewOrigin and Classification of LifeThe origin o.docxmoirarandell
Module 7 Overview
Origin and Classification of Life
The origin of life has been of great debate for centuries. This module will outline the various ideas of how life and Earth itself developed. You will learn the evidence for multiple theories on the origin of life and the evolution of these theories based on new scientific findings.
This module will also focus upon one of the most important achievements of the science of biology: the classification of organisms and the creation of an internationally agreed upon system of nomenclature. Understanding how organisms are classified provides an important basis for any future studies in ecology.
Learning Objectives
Upon completion of this module, you should be able to:
10A
Describe the evidence used to suggest an extraterrestrial source for life on earth.
10B
State the most probable physical conditions on early Earth and the changes thought to have happened before life could exist.
10C
Differentiate between the concepts of spontaneous generation and biogenesis.
10D
Examine the chemical and physical events that must have occurred to have life originate on Earth.
10E
Describe the different hypotheses for what the first living thing might have been like.
10F
Identify the way in which organisms have caused the atmosphere of the earth to change.
10G
State the order and approximate times for major evolutionary events.
10H
Examine the endosymbiotic theory.
10I
Explain the experimental evidence for the origin of life from organic and inorganic material.
10J
Distinguish between taxonomy and phylogeny.
10K
Describe the kinds of tools used to establish phylogenetic relationships.
10L
Distinguish among viruses, viroids, and prions.
10M
Describe the scientific method for naming organisms.
11A
List and give distinguishing characteristics of the kingdoms within the Domain Eukarya.
11B
Distinguish between Bacteria and Archaea.
11C
Explain the features that differentiate organisms as microbes.
11D
List the basic characteristics of members of the Protista, Archaea, Bacteria, and Fungi.
11E
Identify the type of environments in which microorganisms live.
Module 7 Reading Assignment
Enger, E. D., Ross, F. C., & Bailey, D. B. (2012). Concepts in biology (14th ed.). New York: McGraw-Hill. Chapters 19, 20, and 21.
Optional Reading Assignment:
Chapter 22, The Plant Kingdom, and Chapter 23, The Animal Kingdom.
Origin and Classification of Life
Scientists have broken down life into domains of organisms. Scientists believe that at first life, there was first the bacteria domain. The bacteria domain was followed by the archaea domain and finally, the eucarya domain. Domain bacteria and domain archaea remain the same and have not been further broken down. Domain eucarya was further broken down into the plant kingdom, the fungi kingdom, and the animal kingdom.
Organisms live on, in, and within all types of environments. Organisms can be found from pole to pole and everywhere in between. This includ ...
This document provides an introduction to biology and classification. It discusses biology as the study of living things and outlines some key branches and characteristics of biology. The document then explains the importance of classification and outlines the historical development of classification systems. It describes the modern taxonomic units used in classification, from kingdom down to species. The five main kingdoms - Monera, Protoctista, Fungi, Plantae, and Animalia - are identified. The hierarchical relationships between taxonomic groups from kingdom to species are also summarized.
Evolution is the process of change over time through natural selection. The document summarizes key evidence and theories of evolution, including:
1. Evidence from the fossil record shows gradual changes in life forms over billions of years. Comparative anatomy and embryology also provide evidence of common descent.
2. Darwin's theory of evolution by natural selection proposed that heritable variations arise by mutation and are selected if they confer a survival or reproductive advantage. This results in adaptation and potentially speciation.
3. Modern theories incorporate genetics and show how variation arises from sexual reproduction, mutation, and recombination of genes, and how selection can change allele frequencies to drive evolution or maintain genetic equilibrium.
week66.pdfP A R T I I ITheories ofEnvironmental.docxphilipnelson29183
week6/6.pdf
P A R T I I I
Theories of
Environmental Ethics
Copyright 201 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. Due to electronic rights,
some third party content may be suppressed from the eBook and/or eChapter(s). Editorial review has deemed that any suppressed content does not materially
affect the overall learning experience. Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it.
Copyright 201 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. Due to electronic rights,
some third party content may be suppressed from the eBook and/or eChapter(s). Editorial review has deemed that any suppressed content does not materially
affect the overall learning experience. Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it.
6
Biocentric Ethics and the
Inherent Value of Life
DISCUSSION: Synthetic Biology and the Value of Life
Does life itself have inherent moral value?
Several criteria for moral standing were
examined in the previous chapter, includ-
ing sensation and being conscious. For
many observers, such attributes as sensa-
tion and consciousness themselves serve a
higher end of life, and therefore they
conclude that only life itself seems to be
plausible candidate for the inherent value
that moral standing implies. A “biocen-
tric” ethics is an approach that begins
with the inherent value of life as its
foundational principle of value.
The diversity of life on earth is amaz-
ingly complex. Biological science has been
categorizing animal and plant species
since before Aristotle began his taxonomy
of living organisms more than 2,000 years
ago. Current estimates suggest that more
than 1.4 million different species have
been scientifically categorized.1 But, these
categorized species represent only a small
percentage of the actual number of spe-
cies that exist. On the basis of research
conducted in tropical forests, some esti-
mates place the number at more than 30
or 40 million species. Biologist E. O. Wilson
estimates that invertebrate species alone
may number as many as 30 million. Each
species contains from a few members (for
example, the California condor) to many
billions of members (such as bacteria).
Each species exists in an ecological niche in
which its members interact with their
environment to maintain life. Wilson tells
of many highly specialized life-forms.
One of my favorite examples of such
specialists living in microniches are the
mites that live on the bodies of army
ants: one kind is found only on the
mandibles of the soldier caste, where it
sits and feeds from the mouth of its
host; another kind is found only on the
hind foot of the soldier caste, where it
sucks blood for a living, and so on
through various bizarre
configurations.2
125
Copyright 201 Cengage .
Of all the living things, the human body in particular has been a source of curiosity by most of us. No doubt, the field of biology, anatomy and physiology provide us a clear venue to explore and understand it.
This document discusses the connections and interactions between living things through various unifying themes of life. It provides an overview of key concepts like ecology, biological systems, levels of organization, forms and functions, reproduction and inheritance, energy and life, thermal regulation, adaptation and evolution. The document aims to help students understand how living organisms interact with each other and their environment through these interrelated themes. It includes examples, diagrams and questions to illustrate the connections between different organisms and how they depend on one another.
The document provides an introduction to zoology, discussing several key topics:
- Theories of evolution from scientists like Lamarck and Cuvier are summarized, with Darwin's theory of natural selection identified as the most accurate.
- The complex life cycle of the monarch butterfly is used as an example to illustrate different life cycle stages like egg, larva, pupa, and adult.
- Adaptation strategies animals use to survive harsh environments like the desert and polar regions are outlined.
- The process of mitosis and key differences in replication between prokaryotes and eukaryotes are summarized.
- Homeostatic mechanisms that allow animals to maintain stable body conditions are briefly
Classification and taxonomy were established to create a system for grouping and naming organisms to make identification easier. Aristotle was the first to group organisms into plants and animals based on traits like movement. Carl Linnaeus further developed taxonomy by grouping organisms into a hierarchical system of kingdoms, which classified organisms based on increasingly specific characteristics. Taxonomy allows scientists to better identify, compare, and build knowledge about the millions of species in the world.
1. The document discusses 10 themes in studying life, including that each level of biological organization has emergent properties and cells are the basic units of structure and function of organisms.
2. It also covers that the continuity of life is based on heritable DNA and that structure and function are correlated at all levels of biological organization.
3. Additionally, it mentions that organisms are open systems that interact continuously with their environments.
This document provides an overview of key concepts in biology. It discusses the characteristics of life, including organization, metabolism, homeostasis, response, reproduction, and adaptation. It also covers evolution and the classification of organisms. The scientific process is examined, outlining the steps of observation, hypothesis, experimentation, analysis, and theory. Examples are provided to illustrate these concepts. Finally, it discusses some challenges facing society related to science, such as climate change, biodiversity loss, and emerging diseases.
This document provides an overview of a lesson on the development of culture during the prehistoric period. It begins by explaining that prehistory refers to the long period of human existence before the development of writing, and that archaeology is the main source of knowledge about prehistoric times through the excavation and analysis of artifacts and remains. It then discusses key developments like the emergence of eukaryotic cells from prokaryotic cells around 2 billion years ago, allowing for more complex life. Around 541-542 million years ago was the Cambrian explosion where many animal phyla appeared. Early animals that remained in water developed hard body parts that fossilized well. Eventually, some plants and fungi began growing on land, aided by oxygen and
Astronomy - State of the Art - Life in the UniverseChris Impey
Astronomy - State of the Art is a course covering the hottest topics in astronomy. In this section, the potential for life in the universe is covered, including extreme life on Earth, the Drake equation and SETI
The document discusses the key elements (bioelements) needed for living organisms, including the major elements of carbon, hydrogen, oxygen, nitrogen, phosphorus, and calcium which make up 99% of living matter. It also mentions other minor elements needed in small quantities like sulfur, sodium, potassium, magnesium, manganese, iron, copper, zinc, iodine and chlorine. These bioelements are obtained by plants through photosynthesis and from the soil, and then consumed by animals who distribute them throughout the ecosystem.
Define and correctly use scientific terminology in regard to biologic.pdffashioncollection2
Define and correctly use scientific terminology in regard to biological organisms and processes.
Describe specific examples of the inter-relationships between biological function and structure of
the plant and animal systems. Compare and contrast the structures and processes involved in
resource transport in plants and animals. Explain specific examples of adaptations that arise to
meet the various challenges to organisms in general and some specifics to meet challenges in
different environments. Relate the contributions of plants to the ecosystem. Define and
correctly use scientific terminology in regard to biological organisms and physiological
processes used to maintain homeostasis. Describe the hierarchical organization of the body plan
of animals. Describe the adaptations that have taken place from invertebrate to vertebrates in the
digestive, circulatory, excretion, and nervous systems. Describe two specific examples of how
organ systems interact. Describe specific examples of the basic cellular, molecular and gross
anatomy\' of tissues, organs and organ systems and explain the basic function of those tissues
and organs that relate to the circulatory, respiration, renal, and nervous system. Describe how
the endocrine and nervous system integrate all the organ systems of the body of an organism.
Explain how animals communicate internally long distances and what key structures are
involved for this. Assess and describe aspects of sustainability, including economic, societal,
and environmental factors, especially in relation to biological systems. Explain the major
chemical cycles on Earth and how humans affect them.
Solution
1.Some of the terminology includes:
a)Amino acid:The basis building block of agiven protein
b)Aerobic respiration:To take in oxygen and breathe out carbon dioxide
c)Antibiotic:Itis used to kill bacteria.
2)The examples of relation between plants and animals are:
a)The plants are used as sources of food for the animals.
b)The plants can be used for shelter.
3)The resource transport in plants takes place through vascular tissues and leaves to take in
carbon dioxide and water.On the other hand the animals have lungs and nostrils to take in
oxygen and through out CO2.
4.The adaptations example could be of tiger in cold weather in snow.It usually hides inside the
forest and survives in the cold weather while being out always in the hot weather.It goes through
different conditions and makes it through.
my Lesson Exemplars, ELS (2ndQ-W2, S11_12LT-IIa-3) PPT.pptxTristanBabaylan1
This subject description discusses an Earth and Life Sciences learning area that provides a general background in Earth Science and Biology. It presents the history of Earth through geologic time, discusses Earth's structure and composition. It also deals with basic biological principles and covers life processes at the cellular, organism, population, and ecosystem levels. The learning area is designed to help understand Earth Science and Biology.
The document discusses the origins and evolution of life on Earth from its earliest beginnings to present day. It describes early scientific theories on how life began, including spontaneous generation and biogenesis. Miller and Urey's experiment provided evidence that simple organic molecules could form from chemical reactions, and these molecules became the building blocks of cells. Fossil and geological evidence show that early life was prokaryotic and anaerobic, and evolved over billions of years from simple to more complex multicellular forms through natural selection and genetic changes within populations. The fossil record and comparative anatomy provide multiple lines of evidence that all life on Earth shares a common ancestor.
Space Microbiology: Modern Research and Advantages for Human Colonization on ...AnuragSingh1049
Astromicrobiology or exomicrobiology, is the study of microorganisms in outer space. Microorganisms in outer space are most wide spread form of life on Earth, and are capable of colonising any environment, this article usually focus on microbial life in the field of astrobiology. Microorganisms exhibit high adaptability to extreme environments of outer space via phenotypic and genetic changes. These changes may affect astronauts in the space environment as well as on earth because mutant microbes will inevitably return with the spacecraft. In this article, the advantages and disadvantages of microbes in outer space are discussed. We all know that outer space is extreme and very complex environment, microorganisms readily adapt to changes in environmental variables, such as weightlessness, cosmic radiation, temperature, pressure and nutrient levels, and these microorganisms exhibit a variety of morphological and physiological changes. Space conditions may significantly increase the mutation frequency of certain genes in microorganisms, which could allow the cultivation of the bacterial mutants, followed by screening of the bacteria for large scale production. Also we can extract microbial secondary metabolites as medicine, flavouring and nutritional drugs. This article provides the planetary exploration and also provides the microbial observatory program on ISS. The aim of this article will also help us to determine the benefits of bacteria and other microorganisms in case of “Human colonization on Mars”.
This practice worksheet will have you spending time thinking about Cy.pdfjkcs20004
This practice worksheet will have you spending time thinking about Cyanobacteria and some
fellow photosynthesizers. 1. Had this been the year 2013, I would have taught you that all extant
Cyanobacteria are capable of oxygenic photosynthesis. I also would have taught you that some
of the earliest fossils of life on earth are stromatolites, which are beach-ball-sized structures
believed to have been formed by ancient Cyanobacteria 3.5 billion years ago. In 2013, I would
have put these two facts together and taught you that oxygenic photosynthesis must have been
present by 3.5 bilion years ago and that the Great Oxidation Event, which occurred 2.4 billion
years ago when O2 from oxygenic photosynthesis started to accumulate in the atmosphere and
oceans, was simply a long time ( 1 billion years) in the making. However, in the last ten years we
have discovered two lineages of Cyanobacteria that, much to our surprise, proved to be non-
photosynthetic. The phylogenetic relationship of these two new lineages (seen in the image
below) has forced us to reinterpret the timing of the origin of oxygenic photosynthesis. First,
explain why the fossils and phylogeny combine to make us think that oxygenic photosynthesis
might not be as ancient as we once thought. And second, why would a different pattern of
phylogenetic relationship-for example, if these two new lineages had been nested inside of the
clade of previously known cyanobacteria-not have caused us to reconsider our earlier thinking?
2. C4 photosynthesis is a "carbon-concentrating mechanism" found in a variety of plants, most
notably in the grasses. First, briefly explain why some plants would need a carbonconcentrating
mechanism. Why wasn't the traditional version of photosynthesis (known as C3 photosynthesis)
good enough, and what is it that plants are compensating for? And second, briefly explain why
the phylogenetic distribution of C4 photosynthesis (shown in red in the figure below) supports
the claim that C4 photosynthesis is an adaptation. Why, for example, would a single clade of all
those C4 photosynthesizers fail to provide as strong support for the claim? 3. We can trace
ancestry all the way back to LUCA (i.e., the last universal common ancestor, from 3.5 billion
years ago) from present-day eukaryotic algae. We don't think LUCA was an oxygenic
photosynthesizer, nor do we think it was an aerobic respirer. But the algae are both of these.
Three questions here: 1 .) in what order (photosynthesis then respiration, or vice versa)..; 2.)
when (+/1020% is close enough, given our current uncertainty about timing)..; and 3 .) how ...did
the eukaryotic algal lineage come by these two metabolic capabilities?
4. As we've discussed, some of the so-called "major transitions in evolution" represent the
creation of new kinds of individuals (e.8., the origin of eukaryotes, the origin of multicellular
organisms, the origin of animal societies). Among these, some represent the coming together of
unrelated or.
The document discusses the history of life on Earth from its origins to early multicellular life. It describes early scientific theories on the beginning of life and experiments providing evidence against spontaneous generation. Modern scientists believe life began through natural chemical reactions forming organic molecules, as supported by the Miller-Urey experiment. Early life was prokaryotic and anaerobic, with eukaryotes and complex cells developing later through endosymbiosis. Fossils provide evidence of the progression and environments of early life. Radiometric dating allows determining the absolute ages of fossils.
- The document provides learning activity sheets for students covering topics in Earth and life science over 7 weeks.
- Week 1 focuses on the origin and early forms of life, discussing theories for how life began and evidence from fossils. Key theories mentioned include special creation, panspermia, spontaneous generation, evolution, biogenesis, hydrothermal vents, and biochemical evolution. Early life forms included prokaryotic cells like bacteria and archaea and early eukaryotic cells.
- The activities guide students to discuss why studying the origin of life is important, create a diagram of how life formed on Earth, and reflect on what topics around the beginning of life most intrigued them based on what they learned.
Po l2e ch01 lecture principles of life edited sphsJames Franks
The document provides an overview of AP Biology, including information about the AP Biology exam. It discusses the four big ideas of biology: evolution, energy and molecular building blocks, information storage and transmission, and complex interactions between biological systems. It also describes the seven science practices used in biology. The remainder of the document outlines Chapter 1, which discusses the common aspects of structure, function and energy flow in living organisms. It explains that all life on Earth descended from a single-celled common ancestor and shares characteristics like DNA, cells, metabolism and replication. The evolution of prokaryotic and eukaryotic cells as well as multicellular organisms is summarized.
Minor Planet Evidence for Water in the Rocky Debris of a Disrupted Extrasolar...Carlos Bella
Evidence has been found for water in the debris of a disrupted extrasolar minor planet orbiting a white dwarf star. Spectroscopic analysis of the white dwarf's atmosphere revealed an excess of oxygen that cannot be explained by oxide minerals alone, indicating the parent body was originally composed of about 26% water by mass. This demonstrates that water-bearing planetesimals can form around higher mass stars that eventually become white dwarfs. The disrupted planetesimal is the source of a circumstellar debris disk closely orbiting the white dwarf remnant.
This document provides an overview of key concepts in human anatomy and physiology, including definitions of anatomy, physiology, and basic concepts like structure dictates function and homeostasis. It discusses anatomy at different levels from microscopic to macroscopic. Anatomy is the study of the structure and organization of the human body, while physiology is the study of how the body functions. The document emphasizes that understanding the relationship between structure and function is important in anatomy and physiology. It also notes that maintaining homeostasis, or internal stability, is essential for the normal functioning of the body.
This project report was submitted by 4 students from Sitamarhi Institute of Technology for their Bachelor of Technology degree in Computer Science and Engineering. It documents their project work on an unspecified topic for partial fulfillment of their degree requirements. The report includes declarations by the students and their guide, acknowledgments, and outlines the introduction, related work, objectives, requirements, proposed work, system design, code, results, conclusion, and references. It was certified by the guide and head of the department.
Cyber security concepts and terminology are introduced, including the CIA triad of confidentiality, integrity, and availability. Various cyber attacks, threats, and exploits are defined, such as denial of service attacks, social engineering, and zero-day exploits. Information gathering techniques like footprinting, scanning, and enumeration are explained. Free and open source tools for scanning networks, including Nmap and Zenmap, are also covered.
This document discusses the connections and interactions between living things through various unifying themes of life. It provides an overview of key concepts like ecology, biological systems, levels of organization, forms and functions, reproduction and inheritance, energy and life, thermal regulation, adaptation and evolution. The document aims to help students understand how living organisms interact with each other and their environment through these interrelated themes. It includes examples, diagrams and questions to illustrate the connections between different organisms and how they depend on one another.
The document provides an introduction to zoology, discussing several key topics:
- Theories of evolution from scientists like Lamarck and Cuvier are summarized, with Darwin's theory of natural selection identified as the most accurate.
- The complex life cycle of the monarch butterfly is used as an example to illustrate different life cycle stages like egg, larva, pupa, and adult.
- Adaptation strategies animals use to survive harsh environments like the desert and polar regions are outlined.
- The process of mitosis and key differences in replication between prokaryotes and eukaryotes are summarized.
- Homeostatic mechanisms that allow animals to maintain stable body conditions are briefly
Classification and taxonomy were established to create a system for grouping and naming organisms to make identification easier. Aristotle was the first to group organisms into plants and animals based on traits like movement. Carl Linnaeus further developed taxonomy by grouping organisms into a hierarchical system of kingdoms, which classified organisms based on increasingly specific characteristics. Taxonomy allows scientists to better identify, compare, and build knowledge about the millions of species in the world.
1. The document discusses 10 themes in studying life, including that each level of biological organization has emergent properties and cells are the basic units of structure and function of organisms.
2. It also covers that the continuity of life is based on heritable DNA and that structure and function are correlated at all levels of biological organization.
3. Additionally, it mentions that organisms are open systems that interact continuously with their environments.
This document provides an overview of key concepts in biology. It discusses the characteristics of life, including organization, metabolism, homeostasis, response, reproduction, and adaptation. It also covers evolution and the classification of organisms. The scientific process is examined, outlining the steps of observation, hypothesis, experimentation, analysis, and theory. Examples are provided to illustrate these concepts. Finally, it discusses some challenges facing society related to science, such as climate change, biodiversity loss, and emerging diseases.
This document provides an overview of a lesson on the development of culture during the prehistoric period. It begins by explaining that prehistory refers to the long period of human existence before the development of writing, and that archaeology is the main source of knowledge about prehistoric times through the excavation and analysis of artifacts and remains. It then discusses key developments like the emergence of eukaryotic cells from prokaryotic cells around 2 billion years ago, allowing for more complex life. Around 541-542 million years ago was the Cambrian explosion where many animal phyla appeared. Early animals that remained in water developed hard body parts that fossilized well. Eventually, some plants and fungi began growing on land, aided by oxygen and
Astronomy - State of the Art - Life in the UniverseChris Impey
Astronomy - State of the Art is a course covering the hottest topics in astronomy. In this section, the potential for life in the universe is covered, including extreme life on Earth, the Drake equation and SETI
The document discusses the key elements (bioelements) needed for living organisms, including the major elements of carbon, hydrogen, oxygen, nitrogen, phosphorus, and calcium which make up 99% of living matter. It also mentions other minor elements needed in small quantities like sulfur, sodium, potassium, magnesium, manganese, iron, copper, zinc, iodine and chlorine. These bioelements are obtained by plants through photosynthesis and from the soil, and then consumed by animals who distribute them throughout the ecosystem.
Define and correctly use scientific terminology in regard to biologic.pdffashioncollection2
Define and correctly use scientific terminology in regard to biological organisms and processes.
Describe specific examples of the inter-relationships between biological function and structure of
the plant and animal systems. Compare and contrast the structures and processes involved in
resource transport in plants and animals. Explain specific examples of adaptations that arise to
meet the various challenges to organisms in general and some specifics to meet challenges in
different environments. Relate the contributions of plants to the ecosystem. Define and
correctly use scientific terminology in regard to biological organisms and physiological
processes used to maintain homeostasis. Describe the hierarchical organization of the body plan
of animals. Describe the adaptations that have taken place from invertebrate to vertebrates in the
digestive, circulatory, excretion, and nervous systems. Describe two specific examples of how
organ systems interact. Describe specific examples of the basic cellular, molecular and gross
anatomy\' of tissues, organs and organ systems and explain the basic function of those tissues
and organs that relate to the circulatory, respiration, renal, and nervous system. Describe how
the endocrine and nervous system integrate all the organ systems of the body of an organism.
Explain how animals communicate internally long distances and what key structures are
involved for this. Assess and describe aspects of sustainability, including economic, societal,
and environmental factors, especially in relation to biological systems. Explain the major
chemical cycles on Earth and how humans affect them.
Solution
1.Some of the terminology includes:
a)Amino acid:The basis building block of agiven protein
b)Aerobic respiration:To take in oxygen and breathe out carbon dioxide
c)Antibiotic:Itis used to kill bacteria.
2)The examples of relation between plants and animals are:
a)The plants are used as sources of food for the animals.
b)The plants can be used for shelter.
3)The resource transport in plants takes place through vascular tissues and leaves to take in
carbon dioxide and water.On the other hand the animals have lungs and nostrils to take in
oxygen and through out CO2.
4.The adaptations example could be of tiger in cold weather in snow.It usually hides inside the
forest and survives in the cold weather while being out always in the hot weather.It goes through
different conditions and makes it through.
my Lesson Exemplars, ELS (2ndQ-W2, S11_12LT-IIa-3) PPT.pptxTristanBabaylan1
This subject description discusses an Earth and Life Sciences learning area that provides a general background in Earth Science and Biology. It presents the history of Earth through geologic time, discusses Earth's structure and composition. It also deals with basic biological principles and covers life processes at the cellular, organism, population, and ecosystem levels. The learning area is designed to help understand Earth Science and Biology.
The document discusses the origins and evolution of life on Earth from its earliest beginnings to present day. It describes early scientific theories on how life began, including spontaneous generation and biogenesis. Miller and Urey's experiment provided evidence that simple organic molecules could form from chemical reactions, and these molecules became the building blocks of cells. Fossil and geological evidence show that early life was prokaryotic and anaerobic, and evolved over billions of years from simple to more complex multicellular forms through natural selection and genetic changes within populations. The fossil record and comparative anatomy provide multiple lines of evidence that all life on Earth shares a common ancestor.
Space Microbiology: Modern Research and Advantages for Human Colonization on ...AnuragSingh1049
Astromicrobiology or exomicrobiology, is the study of microorganisms in outer space. Microorganisms in outer space are most wide spread form of life on Earth, and are capable of colonising any environment, this article usually focus on microbial life in the field of astrobiology. Microorganisms exhibit high adaptability to extreme environments of outer space via phenotypic and genetic changes. These changes may affect astronauts in the space environment as well as on earth because mutant microbes will inevitably return with the spacecraft. In this article, the advantages and disadvantages of microbes in outer space are discussed. We all know that outer space is extreme and very complex environment, microorganisms readily adapt to changes in environmental variables, such as weightlessness, cosmic radiation, temperature, pressure and nutrient levels, and these microorganisms exhibit a variety of morphological and physiological changes. Space conditions may significantly increase the mutation frequency of certain genes in microorganisms, which could allow the cultivation of the bacterial mutants, followed by screening of the bacteria for large scale production. Also we can extract microbial secondary metabolites as medicine, flavouring and nutritional drugs. This article provides the planetary exploration and also provides the microbial observatory program on ISS. The aim of this article will also help us to determine the benefits of bacteria and other microorganisms in case of “Human colonization on Mars”.
This practice worksheet will have you spending time thinking about Cy.pdfjkcs20004
This practice worksheet will have you spending time thinking about Cyanobacteria and some
fellow photosynthesizers. 1. Had this been the year 2013, I would have taught you that all extant
Cyanobacteria are capable of oxygenic photosynthesis. I also would have taught you that some
of the earliest fossils of life on earth are stromatolites, which are beach-ball-sized structures
believed to have been formed by ancient Cyanobacteria 3.5 billion years ago. In 2013, I would
have put these two facts together and taught you that oxygenic photosynthesis must have been
present by 3.5 bilion years ago and that the Great Oxidation Event, which occurred 2.4 billion
years ago when O2 from oxygenic photosynthesis started to accumulate in the atmosphere and
oceans, was simply a long time ( 1 billion years) in the making. However, in the last ten years we
have discovered two lineages of Cyanobacteria that, much to our surprise, proved to be non-
photosynthetic. The phylogenetic relationship of these two new lineages (seen in the image
below) has forced us to reinterpret the timing of the origin of oxygenic photosynthesis. First,
explain why the fossils and phylogeny combine to make us think that oxygenic photosynthesis
might not be as ancient as we once thought. And second, why would a different pattern of
phylogenetic relationship-for example, if these two new lineages had been nested inside of the
clade of previously known cyanobacteria-not have caused us to reconsider our earlier thinking?
2. C4 photosynthesis is a "carbon-concentrating mechanism" found in a variety of plants, most
notably in the grasses. First, briefly explain why some plants would need a carbonconcentrating
mechanism. Why wasn't the traditional version of photosynthesis (known as C3 photosynthesis)
good enough, and what is it that plants are compensating for? And second, briefly explain why
the phylogenetic distribution of C4 photosynthesis (shown in red in the figure below) supports
the claim that C4 photosynthesis is an adaptation. Why, for example, would a single clade of all
those C4 photosynthesizers fail to provide as strong support for the claim? 3. We can trace
ancestry all the way back to LUCA (i.e., the last universal common ancestor, from 3.5 billion
years ago) from present-day eukaryotic algae. We don't think LUCA was an oxygenic
photosynthesizer, nor do we think it was an aerobic respirer. But the algae are both of these.
Three questions here: 1 .) in what order (photosynthesis then respiration, or vice versa)..; 2.)
when (+/1020% is close enough, given our current uncertainty about timing)..; and 3 .) how ...did
the eukaryotic algal lineage come by these two metabolic capabilities?
4. As we've discussed, some of the so-called "major transitions in evolution" represent the
creation of new kinds of individuals (e.8., the origin of eukaryotes, the origin of multicellular
organisms, the origin of animal societies). Among these, some represent the coming together of
unrelated or.
The document discusses the history of life on Earth from its origins to early multicellular life. It describes early scientific theories on the beginning of life and experiments providing evidence against spontaneous generation. Modern scientists believe life began through natural chemical reactions forming organic molecules, as supported by the Miller-Urey experiment. Early life was prokaryotic and anaerobic, with eukaryotes and complex cells developing later through endosymbiosis. Fossils provide evidence of the progression and environments of early life. Radiometric dating allows determining the absolute ages of fossils.
- The document provides learning activity sheets for students covering topics in Earth and life science over 7 weeks.
- Week 1 focuses on the origin and early forms of life, discussing theories for how life began and evidence from fossils. Key theories mentioned include special creation, panspermia, spontaneous generation, evolution, biogenesis, hydrothermal vents, and biochemical evolution. Early life forms included prokaryotic cells like bacteria and archaea and early eukaryotic cells.
- The activities guide students to discuss why studying the origin of life is important, create a diagram of how life formed on Earth, and reflect on what topics around the beginning of life most intrigued them based on what they learned.
Po l2e ch01 lecture principles of life edited sphsJames Franks
The document provides an overview of AP Biology, including information about the AP Biology exam. It discusses the four big ideas of biology: evolution, energy and molecular building blocks, information storage and transmission, and complex interactions between biological systems. It also describes the seven science practices used in biology. The remainder of the document outlines Chapter 1, which discusses the common aspects of structure, function and energy flow in living organisms. It explains that all life on Earth descended from a single-celled common ancestor and shares characteristics like DNA, cells, metabolism and replication. The evolution of prokaryotic and eukaryotic cells as well as multicellular organisms is summarized.
Minor Planet Evidence for Water in the Rocky Debris of a Disrupted Extrasolar...Carlos Bella
Evidence has been found for water in the debris of a disrupted extrasolar minor planet orbiting a white dwarf star. Spectroscopic analysis of the white dwarf's atmosphere revealed an excess of oxygen that cannot be explained by oxide minerals alone, indicating the parent body was originally composed of about 26% water by mass. This demonstrates that water-bearing planetesimals can form around higher mass stars that eventually become white dwarfs. The disrupted planetesimal is the source of a circumstellar debris disk closely orbiting the white dwarf remnant.
This document provides an overview of key concepts in human anatomy and physiology, including definitions of anatomy, physiology, and basic concepts like structure dictates function and homeostasis. It discusses anatomy at different levels from microscopic to macroscopic. Anatomy is the study of the structure and organization of the human body, while physiology is the study of how the body functions. The document emphasizes that understanding the relationship between structure and function is important in anatomy and physiology. It also notes that maintaining homeostasis, or internal stability, is essential for the normal functioning of the body.
This project report was submitted by 4 students from Sitamarhi Institute of Technology for their Bachelor of Technology degree in Computer Science and Engineering. It documents their project work on an unspecified topic for partial fulfillment of their degree requirements. The report includes declarations by the students and their guide, acknowledgments, and outlines the introduction, related work, objectives, requirements, proposed work, system design, code, results, conclusion, and references. It was certified by the guide and head of the department.
Cyber security concepts and terminology are introduced, including the CIA triad of confidentiality, integrity, and availability. Various cyber attacks, threats, and exploits are defined, such as denial of service attacks, social engineering, and zero-day exploits. Information gathering techniques like footprinting, scanning, and enumeration are explained. Free and open source tools for scanning networks, including Nmap and Zenmap, are also covered.
The document discusses various types of malware like viruses, worms, trojans, spyware, ransomware, and backdoors. It explains what malware is, how it infects systems, and its objectives. Various malware analysis techniques like static analysis, dynamic analysis, code analysis, and behavioral analysis are also summarized. The document also discusses antivirus software, how it works, and examples like Bitdefender, Avast, and Panda. It covers memory management techniques and task management.
The document discusses several topics related to cyber security including biometrics, mobile device hardening, web application security, identity management for web services, authorization patterns, security considerations, and challenges. Specifically, it provides best practices for securing evolving technologies, mobile devices, web servers, web services, implementing identity management, common authorization patterns, important security considerations, and challenges related to implementing security.
The document discusses cybersecurity laws, regulations, and forensics. It provides an overview of cyber laws, which govern internet usage and cybercrimes. Cyber forensics is the process of collecting and analyzing digital evidence for cybercrime investigations. The document also discusses India's National Cyber Security Policy 2013, which aims to create a secure cyber environment in India through public-private partnerships and developing cybersecurity skills. Cybersecurity standards and the roles of governments and the private sector in ensuring cybersecurity are also summarized.
This document provides an overview of cyber security topics including cryptography, cryptanalysis, symmetric and asymmetric key cryptography, hashing, digital signatures, firewalls, user management, and virtual private networks (VPNs). It defines these terms and concepts, compares different techniques like symmetric vs asymmetric cryptography, and packet filtering vs stateful inspection firewalls. The document also discusses the importance of using firewalls and how VPNs can provide privacy and anonymity online.
This document provides an overview of various topics related to cyber security including infrastructure and network security, system security, server security, operating system (OS) security, physical security, network packet sniffing, network design simulation, denial of service (DOS) and distributed denial of service (DDOS) attacks, asset management and audits, intrusion detection and prevention techniques, host-based intrusion prevention systems, security information management, network session analysis, system integrity validation, and some open-source, free and trial tools that can be used for security purposes like DOS/DDOS attacks, packet sniffing, firewalls, and intrusion detection.
The document discusses several topics related to cyber security including vulnerabilities, safeguards, internet security, cloud computing security, and social network security. Some common cyber security vulnerabilities mentioned are weak passwords, outdated software, phishing attacks, malware, and data breaches. Safeguards to address these vulnerabilities include strong passwords, regular software updates, employee training, encryption, access controls and monitoring. The document also outlines security challenges and mitigation strategies for internet usage, cloud computing and social media platforms.
Photosynthesis converts light energy to chemical energy in chloroplasts using chlorophyll. Chloroplasts contain thylakoids which are stacked to form grana. Photosynthesis uses carbon dioxide, water, and light energy to produce glucose and oxygen. The light reactions in thylakoid membranes use photosystems to split water, producing ATP, NADPH, and oxygen. The Calvin cycle in the chloroplast stroma uses ATP and NADPH to reduce carbon dioxide into glucose.
This document discusses different types of gene interactions and single gene disorders. It describes how gene expression can be affected by other genes, either through allelic or non-allelic interaction. Epistasis occurs when a gene's effect depends on the presence or absence of other genes. Single gene disorders can result from mutations in dominant, recessive, or X-linked genes. X-linked disorders particularly affect males since they only have one X chromosome.
Genetics is the scientific study of heredity and inherited variations. Offspring acquire genes from parents through the inheritance of chromosomes. Sexual reproduction combines genes from two parents, leading to genetically diverse offspring. Meiosis produces haploid gametes with one set of chromosomes through two cell divisions in the ovaries and testes. During fertilization, the egg and sperm unite forming a zygote that develops into a multicellular organism through mitosis.
1. The document discusses the key differences between science and engineering. Science aims to understand natural laws through observation, while engineering applies scientific knowledge to solve problems and develop new technologies.
2. It also discusses the importance of studying biology for engineers. Biology can help engineers understand living systems and inspire new designs. It can also help solve problems involving biological processes.
3. The document then answers several questions about basic biology concepts. It defines biology and lists the key characteristics of living organisms. It also explains concepts like Mendel's laws of inheritance, gene interaction, the genetic code, and compares mechanisms of bird flight and aircraft flight.
Enzymes are globular proteins that act as biological catalysts, speeding up chemical reactions without being consumed. They are typically named after their substrate with the suffix "-ase". Enzyme activity can be monitored by measuring changes in substrate or product concentration. Mass spectrometry provides an alternative detection method without needing a chromophore. The enzyme binds its substrate at the active site, forming an enzyme-substrate complex. This lowers the activation energy and allows the reaction to proceed, with the unaltered enzyme then dissociating to catalyze more reactions. Kinetic analysis reveals the individual reaction steps and how enzyme activity is controlled.
Gregor Mendel conducted experiments breeding pea plants to discover the basic principles of heredity. He found that organisms have discrete factors (now known as genes) that determine traits, which exist in two versions (alleles). During reproduction, parents contribute one of each allele to offspring randomly. Mendel also discovered that traits are inherited independently and that dominant alleles mask recessive alleles when both are present. His work formed the basis of classical genetics and established the laws of segregation and independent assortment.
Microbiology is the study of single-celled organisms called microorganisms. Microorganisms are classified into three domains: Archaea, Bacteria, and Eukarya. They are identified using staining techniques, molecular and phylogenetic analysis, growth in special media, microscopy, and other methods. Microscopes, including light microscopes and electron microscopes, are important tools used to visualize microorganisms. Light microscopes use visible light while electron microscopes use electron beams. Microorganisms demonstrate flexibility in surviving extreme environments and use various energy and carbon sources. Studying them provides insights into relationships between life and the environment.
The document discusses biology concepts including the differences between science and engineering, the need for engineers to study biology, the definition and characteristics of living organisms, the working principles of the human eye and digital cameras, Mendel's laws of inheritance, genetic code, gene interaction, and epistasis. It provides detailed explanations of these concepts through examples and definitions in response to multiple questions. The key points are that science aims to understand nature while engineering applies scientific knowledge, biology is relevant for engineering fields involving living systems, and genetics concepts such as Mendel's laws, genetic code, and gene interaction help explain inheritance and variation in traits.
This document discusses the classification of life and the hierarchy of life forms. It notes that biologists categorize organisms into groups and subgroups to make their study easier. Classification is based on characteristics like morphology, anatomy, biochemistry, and ecology. All living things share common themes of organization, information processing, energy and matter transformation, and interactions at different hierarchical levels. Cells are the basic unit of life, and while they can differ, they all descend from earlier cells and share common features. Organisms are classified as unicellular or multicellular depending on whether they are composed of single or multiple cells.
Amino acids are organic molecules that contain an amine group, a carboxyl group, a central carbon atom called the alpha carbon, and a variable side chain. There are 20 common amino acids that differ in their side chains and physical/chemical properties. Amino acids can polymerize through peptide bonds between their carboxyl and amine groups to form polypeptides. Polypeptides are linear chains of amino acids that can further fold into three-dimensional protein structures and carry out biological functions.
Prokaryotic cells are typically smaller than eukaryotic cells, lack membrane-bound organelles, and divide through binary fission. Eukaryotic cells have a nucleus enclosed in a membrane, membrane-bound organelles, cytoskeleton, and divide through mitosis. Autotrophs like plants and algae produce their own food through photosynthesis, heterotrophs depend on other organisms for food, and lithotrophs use inorganic substrates for food through chemosynthesis.
Best Practices for Password Rotation and Tools to Streamline the ProcessBert Blevins
Securing sensitive data is crucial for both individuals and enterprises in the digital era. Password rotation, or regularly changing passwords, has long been a standard security practice. Despite some debate over its effectiveness, password rotation remains an important part of comprehensive security strategies. This guide will explore best practices for password rotation and highlight tools to streamline the process.
The history of rotating passwords dates back to early computer security guidelines, which aimed to reduce the time attackers could exploit stolen credentials by frequently changing passwords. This practice helps mitigate risks associated with credential stuffing, password reuse, and prolonged exposure of compromised passwords. By regularly changing passwords, the time a compromised password can be used is limited, old passwords exposed in breaches are rendered invalid, and regulatory compliance is maintained. Furthermore, frequent changes encourage security awareness among users, reminding them to stay vigilant against phishing and other threats.
To streamline the process of password rotation, various tools and techniques can be employed. Automated password management solutions can schedule and enforce password changes, ensuring compliance with security policies. Additionally, password managers can securely store and generate complex passwords, making it easier for users to adhere to rotation practices without compromising convenience. Implementing multi-factor authentication (MFA) alongside password rotation can further enhance security by adding an extra layer of protection against unauthorized access. By adopting these best practices and utilizing appropriate tools, organizations and individuals can effectively strengthen their cybersecurity posture and safeguard sensitive information.
A vernier caliper is a precision instrument used to measure dimensions with high accuracy. It can measure internal and external dimensions, as well as depths.
Here is a detailed description of its parts and how to use it.
How to Manage Internal Notes in Odoo 17 POSCeline George
In this slide, we'll explore how to leverage internal notes within Odoo 17 POS to enhance communication and streamline operations. Internal notes provide a platform for staff to exchange crucial information regarding orders, customers, or specific tasks, all while remaining invisible to the customer. This fosters improved collaboration and ensures everyone on the team is on the same page.
FD FAN.pdf forced draft fan for boiler operation and run its very important f...MDHabiburRhaman1
FD fan or forced draft fan, draws air from the atmosphere and forces it into the furnace through a preheater. These fans are located at the inlet of the boiler to push high pressure fresh air into combustion chamber, where it mixes with the fuel to produce positive pressure. and A forced draft fan (FD fan) is a fan that is used to push air into a boiler or other combustion chamber. It is located at the inlet of the boiler and creates a positive pressure in the combustion chamber, which helps to ensure that the fuel burns properly.
The working principle of a forced draft fan is based on the Bernoulli principle, which states that the pressure of a fluid decreases as its velocity increases. The fan blades rotate and impart momentum to the air, which causes the air to accelerate. This acceleration of the air creates a lower pressure at the outlet of the fan, which draws air in from the inlet.
The amount of air that is pushed into the boiler by the FD fan is determined by the fan’s capacity and the pressure differential between the inlet and outlet of the fan. The fan’s capacity is the amount of air that it can move per unit of time, and the pressure differential is the difference in pressure between the inlet and outlet of the fan.
The FD fan is an essential component of any boiler system. It helps to ensure that the fuel burns properly and that the boiler operates efficiently.
Here are some of the benefits of using a forced draft fan:Improved combustion efficiency: The FD fan helps to ensure that the fuel burns completely, which results in improved combustion efficiency.
Reduced emissions: The FD fan helps to reduce emissions by ensuring that the fuel burns completely.
Increased boiler capacity: The FD fan can increase the capacity of the boiler by providing more air for combustion.
Improved safety: The FD fan helps to improve safety by preventing the buildup of flammable gases in the boiler.
Forced Draft Fan ( Full form of FD Fan) is a type of fan supplying pressurized air to a system. In the case of a Steam Boiler Assembly, this FD fan is of great importance. The Forced Draft Fan (FD Fan) plays a crucial role in supplying the necessary combustion air to the steam boiler assembly, ensuring efficient and optimal combustion processes. Its pressurized airflow promotes the complete and controlled burning of fuel, enhancing the overall performance of the system.What is the FD fan in a boiler?
In a boiler system, the FD fan, or Forced Draft Fan, plays a crucial role in ensuring efficient combustion and proper air circulation within the boiler. Its primary function is to supply the combustion air needed for the combustion process.
The FD fan works by drawing in ambient air and then forcing it into the combustion chamber, creating the necessary air-fuel mixture for the combustion process. This controlled air supply ensures that the fuel burns efficiently, leading to optimal heat transfer and energy production.
In summary, the FD fan i
OCS Training Institute is pleased to co-operate with
a Global provider of Rig Inspection/Audits,
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& Engineering for Offshore Drilling Rigs, to deliver
Drilling Rig Inspec-tion Workshops (RIW) which
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required to ensure equipment integrity. Candidates
learn to implement the relevant standards &
understand industry requirements so that they can
verify the condition of a rig’s equipment & improve
safety, thus reducing the number of accidents and
protecting the asset.
Development of Chatbot Using AI/ML Technologiesmaisnampibarel
The rapid advancements in artificial intelligence and natural language processing have significantly transformed human-computer interactions. This thesis presents the design, development, and evaluation of an intelligent chatbot capable of engaging in natural and meaningful conversations with users. The chatbot leverages state-of-the-art deep learning techniques, including transformer-based architectures, to understand and generate human-like responses.
Key contributions of this research include the implementation of a context- aware conversational model that can maintain coherent dialogue over extended interactions. The chatbot's performance is evaluated through both automated metrics and user studies, demonstrating its effectiveness in various applications such as customer service, mental health support, and educational assistance. Additionally, ethical considerations and potential biases in chatbot responses are examined to ensure the responsible deployment of this technology.
The findings of this thesis highlight the potential of intelligent chatbots to enhance user experience and provide valuable insights for future developments in conversational AI.
Advances in Detect and Avoid for Unmanned Aircraft Systems and Advanced Air M...
BIO.docx
1. 1
Biology
Unit-1
Q1) Explain Biology as a scientific discipline?
A1) Biology is the branch of natural science that deals with studies of life
and living organisms, that include their physical structure, chemical
process, molecular interactions, physiological mechanisms, development
and evolution. Despite the complex involved in the science, there are
certain concepts that consolidate it into a single, coherent field. Biology
assumes the cell as the basic unit of life, genes as the basic unit of heredity,
and evolution as the engine that propels. The creation and extinction
of species.
Biology derives its word from the ancient Greek words
of βίος; Romanisedbios meaning "life" and -λογία; Romanisedlogia (-logy)
meaning "branch of study" or "to speak". Those combined make the Greek
word βιολογία; Romanisedbiología meaning biology (Study of Life). All
sciences are equally important in that they all expand our collective
understanding of the universe in different areas.
That being said, there is a varying level of difficulty associated with
different sciences when we get past the basics. The advanced concepts in
physics, like general relativity and quantum mechanics require a very high
level of fluency in mathematics that the other sciences. Even the greatest
physicists have claimed to have difficulty understanding the implications of
these complex theories. However, we can understand the most
complicated concepts in biology using only one language, like English or
German. In order to fully understand physics or math, we must also learn
the language of mathematics at its highest level. Thus, biology does not
make it any more or less important but it definitely adds a whole new level
of study and discovery.
Q2) Mention the fundamental differences between camera and eye?
A2) A camera is a man-made device that records images in a tangible
format that may be saved for later use. It is used to create not only
2. 2
photographs but also videos. The word “camera” is derived from Latin
word “camera obscura,” which meaning “dark chamber.”
The human eye is an organ that creates images and sends them to the
brain to be interpreted. It has a ‘cornea’ covering on the outside that
reflects light. It also has an internal lens that dilates and contracts in
response to the light intensity.
Human Eye Camera
The human eye is made up of
the natural nerves and organic
components.
A camera is made up of artificial
materials and components.
Image is not recorded by Human eyes. Camera can record the image.
Blind spot is present in human eyes Blind spot is not present in
camera.
Pupil controls the focus in the human
eyes.
Lens controls the focus in the
camera.
3D image is processed by the human
eye.
2D image is processed by the
camera.
3. 3
Q3) Explain the Brownian motion with examples?
A3) Brownian motion is the random, movement of particles that cannot be
controlled in a fluid as they constantly collide with other molecules
(Mitchell and Kagura, 2006). Brownian motion is thus a part responsible of
the ability of movement in bacteria that do not encode or express motility
movements, such as Streptococcus and Klebsiella species. Brownian
motion can also affect “deliberate” movement exhibited by naturally
motile bacteria that harbour pili or flagella. For example, an Escherichia
coli cell that is swimming toward an area of higher oxygen concentration
may fall “off-track” if it physically encounters a particle moving by
Brownian motion or if such a particle(s) obstructs the bacterial cell’s path
of motion. This form of “interference” adds to the stochasticity with which
bacterial direction can change.
Brownian motion takes its name from the Scottish botanist Robert Brown,
who observed pollen grains moving randomly in water. He described the
motion in 1827 but was unable to explain it. While pedes is takes its name
from Brown, he was not the first person to describe it. The Roman poet
Lucretius describes the motion of dust particles around the year 60 B.C.,
which he used as evidence of atoms.
Examples include:
The motion of pollen grains on still water
4. 4
Movement of dust motes in a room (although largely affected by air
currents)
Diffusion of pollutants in the air
Diffusion of calcium through bones
Movement of "holes" of electrical charge in semiconductors
Q5) Draw a comparison between the flying bird and the Aircraft?
A5) Birds and aircraft are both capable of flying, but they do so in different
ways and for different purposes. Here are some key differences between
the two:
1. Mechanisms of flight: Birds use their wings to generate lift and thrust,
while aircraft rely on engines and airfoils to generate lift and move
forward. Birds also have a lightweight skeleton and strong muscles,
which allow them to generate the necessary forces for flight, while
aircraft need engines and other mechanical components to provide
power.
2. Control and stability: Birds have the ability to control their flight by
adjusting the shape of their wings and using their tail feathers for
stability. In contrast, aircraft use a complex system of controls,
including flaps, ailerons, elevators, and rudder, to control their flight.
3. Range and speed: While birds can fly long distances and reach high
speeds, their range and speed are limited by their energy reserves and
the size of their wings. In contrast, aircraft have much greater range
and speed due to the power of their engines and the efficiency of
their airfoils.
4. Purpose of flight: Birds fly for a variety of reasons, including migration,
hunting, and courtship. Aircraft, on the other hand, are designed
primarily for transportation, whether of people, goods, or military
personnel and equipment.
5. Environmental impact: Birds have a relatively low impact on the
environment, as they use renewable energy sources and emit no
5. 5
pollutants. Aircraft, however, require large amounts of fuel and emit
significant amounts of greenhouse gases, contributing to global
climate change.
In conclusion, while birds and aircraft both have the ability to fly, they do
so in very different ways, with different capabilities, and for different
purposes.
Q9) Biology as a science of life? Explain.
A9) Biology is indeed considered the science of life. It is the study of all
living things, including their physical and chemical processes, interactions
with each other and with their environment, and their evolution and
diversity.
Biology seeks to understand the underlying mechanisms that govern the
behavior of living things. For example, it explores the structure and
function of cells and tissues, the genetics of inheritance and evolution, the
behavior and ecology of organisms, and the interactions between
organisms and their environment.
Biology also encompasses many subdisciplines, such as anatomy,
physiology, ecology, genetics, and microbiology, each of which contributes
to our understanding of different aspects of life.
One of the defining characteristics of life is that living things are able to
maintain a complex internal organization and to respond to changes in
their environment. Biology seeks to understand the mechanisms that allow
living things to maintain this organization and to adapt to changes in their
environment.
Biology has many practical applications, including in medicine, agriculture,
and biotechnology. For example, our understanding of genetics has led to
advances in genetic engineering and the development of new treatments
for genetic diseases. Our understanding of ecology has helped us to better
manage and protect our natural resources.
6. 6
In conclusion, biology is indeed the science of life, exploring the diversity,
structure, function, evolution, and interactions of living things and their
environment.
Q10) Explain the Watson and Crick model?
A10) The Watson and Crick model refers to the discovery of the structure
of the DNA molecule by James Watson and Francis Crick in 1953. DNA
(deoxyribonucleic acid) is a molecule that contains the genetic information
that is passed from one generation of organisms to the next.
Watson and Crick's model showed that DNA is a double helix, meaning that
it consists of two chains of nucleotides that are coiled around each other
like a twisted ladder. The nucleotides in DNA consist of a sugar molecule, a
phosphate group, and a nitrogenous base. The nitrogenous bases in the
two chains are paired in a specific way, with adenine (A) always pairing
with thymine (T), and cytosine (C) always pairing with guanine (G).
The specific arrangement of the nitrogenous bases in the DNA molecule
determines the genetic information that is stored within it. This
information can be read and used by the cell to produce proteins, which
are the building blocks of life.
Watson and Crick's discovery of the structure of DNA was a major
milestone in the field of molecular biology, as it provided a physical
explanation for how genetic information could be stored and transmitted
from one generation to the next. Their work also paved the way for further
research into the molecular basis of genetics and the role of DNA in the
regulation of cellular processes.
Overall, the Watson and Crick model of the structure of DNA is considered
one of the most important scientific discoveries of the 20th century, as it
provided a foundation for our understanding of genetics and the molecular
basis of life.
7. 7
Unit-2
Q2) Explain the hierarchy of biological classification?
A2) The hierarchy of biological classification is a system used to organize
and categorize living organisms based on their evolutionary relationships. It
consists of several levels, each of which groups organisms into increasingly
larger and more inclusive categories. The hierarchy of biological
classification is typically presented as follows:
1. Species: A species is the most basic and fundamental unit of
classification. It is a group of organisms that are capable of
interbreeding and producing fertile offspring.
2. Genus: A genus is a group of related species. For example, the genus
Canis includes the species Canis lupus (wolf), Canis latrans (coyote),
and Canis familiaris (domestic dog).
3. Family: A family is a group of related genera. For example, the family
Canidae includes the genus Canis as well as the genera Lycaon (African
wild dog) and Vulpes (fox).
8. 8
4. Order: An order is a group of related families. For example, the order
Carnivora includes the family Canidae as well as the families Felidae
(cats) and Ursidae (bears).
5. Class: A class is a group of related orders. For example, the class
Mammalia includes the order Carnivora as well as the orders Primates
(primates), Rodentia (rodents), and Cetacea (whales and dolphins).
6. Phylum: A phylum is a group of related classes. For example, the
phylum Chordata includes the class Mammalia as well as the classes
Aves (birds), Reptilia (reptiles), and Amphibia (amphibians).
7. Kingdom: A kingdom is the highest level of classification, and includes
all living organisms. The traditional classification system recognizes
five kingdoms: Monera (prokaryotes), Protista (single-celled
eukaryotes), Fungi, Plantae (plants), and Animalia (animals).
This hierarchical system of classification is based on evolutionary
relationships, with each higher level grouping together organisms that
share a common ancestry. By organizing organisms into categories based
on their relationships, biologists can better understand the evolutionary
history of life on Earth and the relationships between different species.
Q3) Explain unicellular and multicellular organisms?
A3) A unicellular organism is an organism that possess a single cell. This
means all life processes or activities, such as reproduction, digestion,
feeding and excretion, occur in one single cell. Amoebas, bacteria, and
plankton are just some types of unicellular organisms. They are typically
microscopic and cannot be seen with the naked eye. Although much
smaller, unicellular organisms can perform some of the same complex
activities similar to multicellular organisms. Many unicellular organisms can
live in extreme environments, such as hot springs, thermal ocean vents,
polar ice, and frozen tundra. These unicellular organisms are collectively
called extremophiles. Extremophiles are resistant to extremes of
temperature or pH, and are specially adapted to live in places where
multicellular organisms cannot survive. This unique feature allows
9. 9
scientists to use unicellular organisms in many ways previously only
imagined. However, not all unicellular organisms are extremophiles. Many
other unicellular organisms live under the same narrow range of living
conditions as multicellular organisms, but still produce things necessary to
all life forms on Earth.
Multicellular organism, are organism composed of many cells, which vary
in degrees that are integrated and independent. The development of
multicellular organisms is followed by division of labour and cellular
specialization; cells become efficient in one process and are dependent
upon other cells for the necessities of life and survival.
A tissue, organ or organism that is made up of many cells is known as
multicellular. Humans, Animals, plants, and fungi are multicellular
organisms in nature and often, there is specialization of different cells for
various functions. Multicellular organisms assign biological responsibilities
such as barrier function, circulation, digestion, respiration and sexual
reproduction to specific organ systems such as the skin, heart, stomach,
lungs, and sex organs. These organs are composed of many different cells
and cell types that work together to perform specific tasks.
Q5) How are Autotrophs different from lithotrophs?
A5) Autotrophs: Autotrophs are organisms that can prepare their own
food, using materials from inorganic sources. The word “autotroph” is
derived from the root words “auto” for “self” and “troph” for “food.” An
autotroph is an organism that prepares its own food, without depending
on other organisms.
Autotrophs are extremely important and, in the absence of these
Autotrophs, no other forms of life can exist. Without plants that create
sugars from carbon dioxide gas and sunlight through the process
called photosynthesis.
Autotrophs are often called “producers.” They form the base of
an ecosystem’s energy pyramid, and provide the food for all the
10. 10
heterotrophs (organisms that must get their food from others) need to
exist.
Autotrophs more rarely, obtain chemical energy through oxidation
(chemoautotrophs) to make organic substances from inorganic ones.
Autotrophs do not consume other organisms; they are, however,
consumed by heterotrophs.
Lithotrophs
An organism that obtains its energy from inorganic compounds (such as
ammonia) through electron transfer, lithotroph is derived from (Greek
word lithos, meaning “stone”), is the ability of organisms to obtain energy
by the transfer of electrons from hydrogen gas to inorganic acceptors. It
has been proposed that the earliest forms of life on Earth used
lithotrophic metabolism and that photosynthesis was a process was later
identified.
Q10) Define Extremophiles?
A10) Many unicellular organisms can live in extreme environments, such as
hot springs, thermal ocean vents, polar ice, and frozen tundra. These
unicellular organisms are collectively called extremophiles. Extremophiles
are resistant to extremes of temperature or pH, and are specially adapted
to live in places where multicellular organisms cannot survive. This unique
feature allows scientists to use unicellular organisms in many ways
previously only imagined. However, not all unicellular organisms are
extremophiles. Many other unicellular organisms live under the same
narrow range of living conditions as multicellular organisms, but still
produce things necessary to all life forms on Earth.
Unit-3
Q3) Define Gene Mapping and Gene Interaction?
A3) Gene mapping refers to one of the two different ways of positioning
the gene on a chromosome. The first type of gene mapping was also called
genetic mapping. Genetic mapping determines how two genes on a
11. 11
chromosome relate in their positions, with the use of linkage
analysis. Physical mapping, which is the other type of gene mapping,
locates genes by their absolute positions on a chromosome using any
available technique. Once a gene is located, its DNA sequence determined,
it can be cloned and its molecular product studied.
Gene Interaction
Gene interactions can result in the suppression or alteration of a
phenotype. This occurs when an organism inherits two different dominant
genes, for example, resulting in incomplete dominance. This is commonly
seen in flowers, where breeding two flowers that pass down dominant
genes can result in a flower of an unusual colour caused by incomplete
dominance. If red and white are dominant, for example, the offspring
might be pinkish or striped in colour as the result of a gene interaction.
Q4) Explain the concept of Law of Independent and Law of segregation?
A4) The Law of Independent Assortment and the Law of Segregation are
two important principles in genetics that describe the behavior of genes
during the formation of gametes (sperm and egg cells).
The Law of Segregation
states that each individual
organism has two copies of
each gene, one from each
parent, and that during the
formation of gametes, each
gene segregates so that
only one copy goes into
each gamete. This means
that each gamete will
receive one and only one
copy of each gene. For
example, if an organism has
two copies of the gene for eye color, one blue and one brown, during the
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formation of gametes, each gamete will receive either the blue or the
brown gene, but not both.
The Law of Independent Assortment states that each pair of genes
segregates independently of each other during the formation of gametes.
This means that the segregation of one gene does not affect the
segregation of another gene. For example, the segregation of the gene for
eye color does not affect the segregation of the gene for hair color.
These two laws were first described by Gregor Mendel, the father of
modern genetics, through his studies of pea plants. The laws of
independent assortment and segregation form the basis of our
understanding of the inheritance of genetic traits, and they continue to be
important concepts in modern genetics.
Q5) Define Mitosis and Meiosis?
A5) Mitosis is the process that occurs when somatic cell divides to form
two daughter cells. It is an important process in normal organism
development, Mitosis requires a set of specialized cell
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structures. Chromosomes are the most important part for mitosis because
they are separated during the process and evenly distributed into two
daughter cells. The spindle is formed around a cytosolic structure called
centrosome, which is main driving force for chromosome separation.
Meiosis is the type of cell division by which germ cells (eggs and sperm) are
produced. Meiosis involves a reduction in the amount of genetic material,
during meiosis, chromosomes are also duplicated, cell division occurs twice
consecutively, leading the half of the chromosome number in 4 daughter
cells. This process is used for generating germ line cells, the gametes.
Fig: Mitosis is the process that occurs when somatic cell divides to form
two daughter cells and During meiosis, chromosomes are also duplicated,
cell division occurs twice consecutively, leading the half of the
chromosome number in 4 daughter cells
Q7) Explain the single Gene disorders in humans?
A7) When a certain gene is found to cause a disease, we refer to it as a
single gene disorder or a Mendelian disorder. In fact, single gene disorders
are not very common. For example, only one in 2,500 people are born with
cystic fibrosis. There are a number of inheritance patterns of single gene
disorders that are predictable it is figured out.
There are more than 4,000 human diseases caused by single mutated
genes that can be passed on to subsequent generations in either a
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dominant or recessive manner. Both egg and sperm providers may
unknowingly be carriers of a single gene disorder, which makes it crucial to
screen both partners.
Some examples of single-gene disorders include
1. Cystic fibrosis,
2. Alpha- and beta-thalassemia’s,
3. Fragile X syndrome
4. Marfan syndrome
5. Sickle cell Anaemia
6. Huntington's disease, and
7. Hemochromatosis.
Q10) Explain the concept of matching Phenotype to genes?
Ans. The mapping of a set of genotypes to a set of phenotypes is
sometimes referred to as the genotype–phenotype an organism's genotype
has a great influence (the largest by far for morphology) in the formation of
its phenotype, but this is not the only case. Even two organisms with
identical genotypes show differences in their phenotypes. One of the
experiences in everyday life with identical twins (monozygous). Identical
twins share the same genotype, since their genomes are identical; but they
show the same phenotype, although their phenotypes may look similar.
This is apparent that their mothers and close friends can spot minute
differences, even though others might not be able to see the subtle
differences. Further, identical twins can be distinguished by
their fingerprints, which are never completely identical.
Q5) Explain the differences between DNA and RNA?
A5)
Comparison DNA RNA
Full Name Deoxyribonucleic Acid Ribonucleic Acid
Function DNA replicates and stores
genetic information. The
RNA converts the genetic
information contained
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special feature is it is the
blueprint for all genetic
information contained within
an organism
within DNA to a format
used to build proteins, and
then moves it to ribosomal
protein factories.
Structure DNA consists is double
stranded, arranged in a double
helix. These strands are made
up of subunits called
nucleotides. Each nucleotide
contains a phosphate, a
nitrogenous base and a 5-
carbon sugar molecule.
RNA only is single stranded,
but like DNA, strand is
made up of nucleotides.
RNA strands are shorter
than DNA strands. RNA
sometimes forms a
secondary double helix
structure, but only
occasionally.
Length DNA is a much longer polymer
than RNA. A chromosome, for
example, is a single, long DNA
molecule, when opened would
be several centimetres in
length.
RNA molecules vary in
length, but are found to be
much shorter than long
DNA polymers. A large RNA
molecule may be a
thousand base pairs in
length.
Sugar The sugar in DNA is
deoxyribose, which contains
one less hydroxyl group than
RNA’s ribose.
RNA contains ribose sugar
molecules, without the
hydroxyl modifications of
deoxyribose.
Bases The bases in DNA are Adenine
(‘A’), Thymine (‘T’), Guanine
(‘G’) and Cytosine (‘C’).
RNA shares Adenine (‘A’),
Guanine (‘G’) and Cytosine
(‘C’) with DNA, but contains
Uracil (‘U’) rather than
16. 16
Thymine.
Location DNA is found in the nucleus,
with a small amount of DNA
also present in mitochondria.
RNA forms in the nucleolus,
and then moves to
specialised regions of the
cytoplasm depending on
the type of RNA formed.
Reactivity Due to its deoxyribose sugar,
which contains one less
oxygen-containing hydroxyl
group, DNA is a more stable
molecule than RNA, which is
useful for a molecule which
has the task of keeping genetic
information safe.
RNA, containing a ribose
sugar, is more reactive than
DNA and performs
enormous tasks but is not
stable in alkaline
conditions. RNA’s larger
helical grooves mean it is
more easily affected by the
attack of enzymes.
Ultraviolet
(UV)
Sensitivity
DNA is vulnerable to damage
by ultraviolet light.
RNA is more resistant to
damage from UV light than
DNA.
Q7) How are amino acids different from proteins?
A7) Amino acids are organic compounds in nature and combine to form
proteins molecules. Amino acids and proteins are the building blocks of all
lifeforms. When proteins are broken down or digested, amino acids are
left. Compared to any other class of macromolecules, Proteins are among
the most abundant organic molecules in living systems and are way more
diverse in structure and function. A single cell can contain thousands of
proteins, each having a unique function. All proteins are made up of one or
more chains of Amino acids although their structures, like their functions.
17. 17
Proteins can play a wide array of roles in a cell or organism. The common
protein is important in the biology of many organisms (including
humans). Proteins come in many different shapes and sizes. Some are
globular (roughly spherical) in shape, whereas others form long, thin fibers.
For example, the haemoglobin protein that carries oxygen in the blood is a
globular protein, while collagen, found in the skin, is a fibrous protein.
Amino acids are the monomers that make up proteins. Specifically, a
protein is made up of one or more linear chains of amino acids, each of
which is called a polypeptide. There are 20 different types of amino
acids present in proteins
Amino acids share a basic structure, which consists of a central carbon
atom, also known as the alpha (α) carbon, bonded to an amino group (NH2)
a carboxyl group {COOH}and a hydrogen atom.
Basic structure of an amino acid, every amino acid also has another atom
or group of atoms bonded to the central atom, known as the R group,
which determines the identity of the amino acid. For instance, if the R
group is a hydrogen atom, then the amino acid is glycine etc.
Q8) Write a short note on Cellulose?
A8) Cellulose a complex carbohydrate, or polysaccharide, consisting of
3,000 or more glucose units. They form the basic structural component of
plant cell walls; cellulose comprises about 33 percent of all
vegetable matter and is the most abundant naturally occurring
18. 18
organic compounds. Cellulose cannot be digested by man, cellulose is a
source of food for herbivorous animals (e.g., cows, horses) because they
retain it long enough for digestion by microorganisms present in the
alimentary tract; protozoans in the gut of insects such as termites also
digest cellulose. It has great economic importance, cellulose is processed to
produce papers and fibres and is chemically modified to yield substances
used in the manufacture of such items as plastics, photographic films,
and rayon. Other cellulose derivatives are used as thickening agents for
foods adhesives, explosives, and in moisture-proof coatings.
Q9) Define Denaturation?
A9) A protein’s shape is critical to its function, and, many different types of
chemical bonds may be important in maintaining this shape. Changes in
temperature and pH, as well as the presence of certain chemicals, may
disrupt a protein’s shape and cause it to lose functionality, a process
known as denaturation.
Denaturation is a process in which proteins or nucleic acids lose the
quaternary structure, tertiary structure, and secondary structure which is
present in their native state, by application of some external stress or
compound such as a strong acid or base, a concentrated inorganic salt, an
organic solvent (e.g., alcohol or chloroform), radiation or
heat. Since denaturation reactions are not strong enough to break the
peptide bonds, the primary structure (sequence of amino acids) remains
the same after a denaturation process. Denaturation disrupts the normal
alpha-helix and beta sheets in a protein and uncoils it into a random shape.
Q10) Short notes on starch?
A10) Starch, is a granular, white, organic chemical that is produced by all
green plants. Starch is a soft, white, tasteless powder that is insoluble in
alcohol, cold water, or other solvents. The basic chemical formula of the
starch molecule is (C6H10O5)n. Starch is a polysaccharide comprising of
glucosemonomers that are joined in α 1,4 linkages. The simplest form of
starch is the linear polymer amylose; amylopectin is the branched form.
19. 19
Starch is manufactured in the green leaves of plants from the excess
glucose produced during process of photosynthesis and serves as a reserve
food supply for the plant. Starch is stored in chloroplasts of the cell in the
form of granules and in others as storage organs in the roots of the cassava
plant; the tuber of the potato; the seeds of corn, wheat, and rice and
the stem pith of sago. According to the requirement, starch is broken
down, in the presence of certain enzymes and water, into its constituent
monomer glucose units, which diffuse from the cell to nourish the plant
tissues. In humans and other animals, starch from plants is broken down
into its constituent sugar molecules, which then supply energy to the
tissues.
Q2) How are Enzyme catalyzed reactions monitored?
A2) Monitoring the rate of an enzyme- that catalyses a reaction is called
‘enzyme kinetics’. The kinetics of an enzyme-catalysed reaction can
indirectly provide information about the mechanism of catalysis. The rate
or velocity of a reaction is the change in the concentration of reactant or
product per unit of time
The rate of enzyme reaction is measured by the amount of substrate
changed or amount of product formed during a period of time.
The rate is determined by measuring the slope of the tangent to the
curve in the initial stage of the reaction. The steeper the slope, the
greater is the rate.
If enzyme activity is measured over a period of time, the rate of
reaction usually falls, most commonly as a result of a fall in the
substrate concentration.
The rate of reaction is proportional to the enzyme concentration
provided that the substrate concentration at high level.
If the enzyme concentration is increases, the rate of reaction
increases.
20. 20
For a give enzyme concentration, the rate of reaction increases with
increase in substrate concentration until all the available active sites are
occupied by the substrates.
Once all the active sites are used up, the rate of reaction remains constant
with increase in substrate concentration. Therefore, the theoretical
maximum rate is never quite obtained. The extra substrate has to wait until
the next enzyme/substrate complex release product before it takes part in
another reaction.
Under constant other factor, pH affects the rate of reactions.
Is Optimum pH being the pH at which the rate of enzyme-
controlled reaction is maximum pH which is different for different
enzymes.
Rate of reaction decreases when the pH is either increased or
decreased from its optimum value. The ionic charge of acidic or basic
groups are altered with change in ph. And therefore disrupt the ionic
bonding that helps to maintain specific shape of enzyme
Thus, change in pH leads to alteration of enzyme shape including the
active site.
If extreme pH is introduced then it will denature the enzymes.
21. 21
The rate of enzyme activity is maximum, at optimum ph.
Q4) Explain the Lock and key mechanism of enzyme action?
A4) The lock-and-key analogy sees this process as very specific, further only
a particular key can fit into the keyhole of the specific lock. If the key is in
any way smaller, larger or simply a different shape, then it does not fit into
the keyhole, and subsequently a reaction cannot take place. The theory
was first described by Emile Fischer (lock-and-key analogy) in 1894, and
since then many other theories to were discovered explain the mechanics
of enzyme reactions.
The substrate binds to the active site, and a reaction takes place that
ultimately causes the release of the formed product. Enzymes catalyse this
reaction by facilitating chemical bond changes in the substrate through
altering the distribution of electrons.
Q6) Factors that influence Enzyme activity?
A6) The rate at which an enzyme works is influenced by many important
factors, e.g.,
The concentration of substrate molecules-
(When their availability is more, the quicker the enzyme molecules collide
and bind with them). The concentration of substrate is designated [S] and
is expressed in units of molarity.
The temperature-
22. 22
As the temperature rises, molecular motion also increases — and therefore
collisions between enzyme and substrate — speed up. But as enzymes are
proteins, there is an upper limit beyond which the enzyme
becomes denatured and ineffective high temperatures can denature
proteins.
The presence of inhibitors.
Competitive inhibitors are molecules that bind to the same site as the
substrate — preventing the substrate from binding to the enzyme
active site — but are not changed by the enzyme.
Non-competitive inhibitors are molecules that bind to some other site
on the enzyme reducing the power of the catalysis.
PH.
PH influences the conformation of a protein and as enzyme activity is
crucially dependent on protein conformation, its activity is affected
accordingly.
Q8) Explain the difference between Catalyst and an Enzyme?
A8) Catalyst and enzyme are two substances that increase the rate of a
reaction without being changed by the reaction. There are two types of
catalysts as enzymes and inorganic catalysts. Enzymes are a type of
biological catalysts. The main difference between catalyst and enzyme is
that catalyst is a substance that increases the rate of a chemical reaction
whereas enzyme is a globular protein that can increase the rate of
biochemical reactions. The inorganic catalysts include mineral ions or
small molecules. In contrast, enzymes are complex macromolecules with
3D structures. Enzymes are specific and work in mild conditions.
Catalyst Enzyme
Catalyst defined as the molecules that
speed up the
Rate of a reaction without having a
change in its structure.
An enzyme is known as a
Biological catalyst and
Globular protein that
Speed up natural reactions.
Correlation
23. 23
Could either be enzymes or inorganic
salts
Considered as a type of a
Catalyst
Type
Mineral ions or small molecules Globular proteins
Size Difference
Similar in size to the molecule of
substrate
Very larger as compared to
The substrate molecule
Molecular Weight
The molecular weight is low The molecular weight of
Enzymes are high
Action
Normally act on physical reactions Always act on biochemical
Reactions
Efficiency
Work less efficiently Work highly efficiently
Specificity
Can maximize the rate of various set of
reactions
Can only act and increase
The rate of a particular
Reaction
Regulator Molecules
Cannot control the function of inorganic
catalysts
Can regregulate the function of
enzymes by
Binding bindingof
regulatory molecules with the
Specific enzyme
Temperature
Not sensitive to small temperature
changes, so they
Work at high temperatures
Temperature specific, so at
Low temperature, enzymes
Become inactive, and at high
Temperature, enzymes Get
denatured
24. 24
PH
Not usually sensitive to small changes
occurring in pH
Sensitive to small pH changes
and
Operate only at a specific range
of
PH
Pressure
Work only at high pressure Work only at normal pressure
Protein Poisons
Protein poisons contain no effect Can be affected and poisoned by
Protein poisons
Short Wave Radiations
Contain no effect on the inorganic
catalysts
Can have denatured the
enzymes
Examples
Iron, platinum, and vanadium oxide Glucose-6-phosphate, alcohol
Dehydrogenase, amylase, lipase,
And aminotransferase