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Unformatted text preview: 1 Chapter 28: Protists Eukaryote Phylogeny Yellow boxes (top row) indicate “protist” kingdoms Don’t worry about the various branch points ProtistDiversity Paramecium Malaria Kelp Giardia Morphological Diversity Morphological Diversity Structural Diversity “Protists exhibit more structural and functional diversity than any other group of organisms.” p. 549, Campbell & Reece (2005) “Most protists are unicelluar, although there are some colonial and multicellular species.” p. 549, Campbell & Reece (2005) “Unicellular protists are justifiably considered the simplest eukaryote, but at the cellular level, many protists are exceedingly complex—the most elaborate of all cells.” p. 549, Campbell & Reece (2005) 2 More ProtistDiversity ¡ The terms “Protist”, “Protozoa”, and “Algae” have no taxonomic meaning ¡ “Protists” are paraphyletic in five-kingdom system ¡ Protists are mostly aerobic, motile, & aquatic, but can be found in most damp environments ¡ Protists are mostly heterotrophic but also include autotrophs and mixotrophs, which are both autotrophic and heterotrophic ¡ Protists can be distinguished in terms of how they obtain nutrients into engulfers, adsorbers, and algae (autotrophs Æ contain chloroplasts) ¡ There are both asexual and sexual protists ¡ There are protists that display no mitosis in diploid state as well as ones that display an alternation of generation ¡ Protists are important predators (heterotrophic engulfers) and producers (the algae) Protist Nutritional Diversity “We can divide protists (nutritionally) into three categories…” p. 550, Campbel & Reece (2005) “…photosynthetic (plant-like) protists, or algae (singular, alga )…” “…ingestive (animal-like) protists, or protozoans…” “…and absorptive (fungus-like) protists, which have no other general name…” Also, protists can be bottom dwellers (benthic), free floating (planktonic), or...
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