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Lecture 26

BIOL 1010 Lecture 26: Lecture 26

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Biological Sciences
BIOL 1010
Emily A.Mc Kinnon

c78 Bio 1010 CHAPTER 18 Protists 18.1) Protists are an extremely diverse assortment of eukaryotes Protists are a diverse collection of mostly unicellular eukaryotes Used to be classified in a kingdom called Protista, but now it is thought that they constitute multiple kingdoms within domain Eukarya Protest is useful as a convenient term to refer to eukaryotes that are not plants, animals, or fungi They obtain their nutrition in a variety of ways o Some are autotrophs, who make their food by photosynthesis Ex) algae (many are multicellular) Some are protozoans, they are heterotrophs, eat bacteria and other protists - Ex) fungus-like obtain molecules by absorption Some are parasites, who derive their nutrition from a living host, which is harmed by this interaction - Ex) Giardia is human parasite Some are mixotrophs, they can do both photosynthesis and heterotrophy depending on availability of light and nutrients Ex) Euglena Protist habitats also diverse Most protists are aquatic, and are found almost anywhere there is moisture, including terrestrial habitats like damn soil, and leaf litter Others inhabit bodies of host organisms - Ex) protists that are endosymbionts in the intestinal tract of termites Termite endosymbionts digest the tough cellulose in the wood eaten by their host, some even
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