HW #28 - AP Biology Period 4 #22 Liem Nguyen 1/16/10...

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AP Biology Period – 4 #22 Liem Nguyen 1/16/10 Homework #28 ( 090213 ): Chapter 28 (due Friday 090213 ) Total points: 40 for Attempt on all questions Concept Map: 10 Points Protists Objectives Protists Are Extremely Diverse 1. Explain why the kingdom Protista is no longer considered a legitimate taxonomic group. advances caused it to crumble paraphyletic lineages of protists recognized as kingdoms protist, convenient way to refer to eukaryotes Advances in systematics crumbled. Protista is paraphyletic, and some protists are more closely related to plants and animals than to other protists. Some lineages of protists can be recognized as kingdoms. The word protist is a convenient way to refer to eukaryotes that are not plants, animals, or fungi. 2. Describe the different nutritional strategies of protists. photoautotrophs, contain chloroplasts heterotrophs, absorb organic molecules ingest larger food particles mixotrophs, combine both types most nutritionally diverse of eukaryotes Some are photoautotrophs, which contain chloroplasts while others are heterotrophs, which absorb organic molecules or ingest larger food particles. There are also mixotrophs, which combine both types. Protists are the most nutritionally diverse of all eukaryotes. 3. Describe the three ecological categories of protists. Explain why the terms protozoa and algae are not useful as taxonomic categories. photosynthetic protists, algae: plant-like ingestive protists, protozoans: animal-like absorptive: fungus-like alga, protozoan useful in discussing protist ecology do not refer to monophyletic There are photosynthetic, plant-like protists, ingestive, animal-like, and absorptive, fungus-like protists. Although alga and protozoan are useful in discussing protist ecology, they do not refer to monophyletic groups. 4. Describe the evidence that supports the theory that mitochondria and plastids
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evolved by serial endosymbiosis. Explain which living organisms are likely relatives of the prokaryotes that gave rise to mitochondria and plastids. DNA of plastid gene in algae 2 membranes cyanobacteria DNA of plastid genes in red algae and green algae closely resembles the DNA of cyanobacteria. Also, plastids in red algae and green algae are surrounded by two membranes, which correspond to the inner and outer membranes of gram- negative cyanobacterial endosymbionts. All eukaryotes have mitochondria or had them in the past. 5. Describe the evidence that suggests that mitochondria were acquired before plastids in Eucharistic evolution. alpha proteobacteria photosynthetic cynobacterium (earlier) The early origin of mitochondria is supported by the fact that all eukaryotes studied so far either have mitochondria or show signs that they had them in the past. Later an additional photosynthetic cyanobacterium was acquired. The evidence is that photosynthetic beings came later.
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HW #28 - AP Biology Period 4 #22 Liem Nguyen 1/16/10...

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