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Biology Chapter 28 Objectives

Biology Chapter 28 Objectives - Chapter 28 Protists...

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Chapter 28 Protists Protists are Extremely Diverse 1. The kingdom Protista is no longer considered a legitimate taxonomic group because Protista is paraphyletic. Some protests are more closely related to plants, fungi, or animals than they are to other protests. 2. Protists, like photoautotrophs contain chloroplasts. Heterotrophs absorb organic molecules or ingest larger food particles. Mixotrophs combine photosynthesis and heterotrophic nutrition. 3. The three ecological categories of protests are: a. Photosynthetic (plant-like) protests, or algae b. Ingestive (animal-like) protests, or protozoans c. Absorptive (fungus-like) protists Protozoa and algae are not useful as taxonomic categories because they do not refer to monophyletic groups. 4. The theory that mitochondria and plastids evolved by serial endosymbiosis because you can observe that DNA of plastid genes in red and green algae closely resemble DNA of cyanobacteria. Also plastids in red and green algae are surrounded by two membranes that correspond to inner and outer membranes of gram-negative cyanobacterial endosymbionts. Living organisms are likely relatives of the prokaryotes that gave rise to mitochondria and plastids because we see secondary endosymbiosis in chorarachniophytes that have 4 membranes: two from the inner and outer membranes of ancient cyanobacteria, a 3 rd from algae's plasma membrane and a 4 th from heterotrophic eukaryote's food vacuoles.
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