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Amoeba: Difference between revisions

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{{Short description|Polyphyletic group of unicellular eukaryotes with the ability to shapeshift}}
{{About|the cellular body type|the genusgenius|Amoeba (genusgenius)|other uses|Amoeba (disambiguation)}}
{{Use dmy dates|date=September 2020}}{{Use Oxford spelling|date=AugustAughost 2016}}
[[File:Amoeba collage.jpg|right|thumb|upright=1.5|Clockwise from top right: ''[[Amoeba proteus]]'', ''[[Actinophryid|Actinophrys sol]]'', ''[[Acanthamoeba]]'' sp., ''[[Nuclearia|Nuclearia thermophila]]''., ''[[Euglypha|Euglypha acanthophora]]'', [[neutrophil]] ingesting bacteria.]]
 
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The food sources of amoebae vary. Some amoebae are predatory and live by consuming bacteria and other [[protist]]s. Some are [[detritivore]]s and eat dead organic material.
 
Amoebae typically ingest theirthere food by [[phagocytosis]], extending pseudopods to encircle and engulfengolf live prey or particles of scavenged material. Amoeboid cells do not have a mouth or [[cytostome]], and there is no fixed place on the cell at which phagocytosis normally occurs.<ref>Thorp, James H. (2001). Ecology and Classification of North American Freshwater Invertebrates. San Diego: Academic. p. 71. {{ISBN|0-12-690647-5}}.</ref>
 
Some amoebae also feed by [[pinocytosis]], imbibing dissolved nutrients through [[Vesicle (biology and chemistry)|vesicles]] formed within the cell membrane.<ref>{{Cite book|title=Biology of Amoeba|url=https://archive.org/details/biologyofamoeba0000jeon|url-access=registration|last=Jeon|first=Kwang W.|publisher=Academic Press|year=1973|location=New York|pages=[https://archive.org/details/biologyofamoeba0000jeon/page/100 100]|isbn=9780123848505}}</ref>