07-09-08

07-09-08 - 07-09-08 Ch. 28 Protists Concept 28.1 Protists...

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07-09-08 Ch. 28 Protists Concept 28.1 Protists are an extremely diverse assortment of eukaryotes A. Intro a. Protists are more diverse than all other eukaryotes i. No longer considered a single kingdom b. Mostly unicellular, but some colonial and multicellular forms c. Reproduce sexually and asexually B. Protists are nutrionally diverse a. Photoautotroph i. Contains chloroplasts, photosynthesize b. Heterotrophs i. Absorb organic molecules or ingest larger particles c. Mixotrophs i. Combine photosynthesis and heterotrophic nutrition C. Endosymbiosis in Eukaryotic Evolution a. Much protest diversity has its origin in endosymbiosis b. Plastid-bearing lineage evolved into red and green algae c. Both underwent secondary endosymbiosis ***Secondary symbiosis usually indicated by 4 plasma membranes*** D. Motility in Protists a. Flagellates: move by 1 or more flagellae b. Ciliates: move by coordinated movement of cilia c. Amoebae: move by means of pseudopodia E. Sexual reproduction in Protists a. Protists have a wide variety of life histories
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i. Zygotic life cycle: Plasmodium, which causes malaria ii. Alternation of genes: many algae and all land plants F. Concept 28.3 Euglenozoans have flagella with a unique internal structure
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07-09-08 - 07-09-08 Ch. 28 Protists Concept 28.1 Protists...

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