Ch.28 - Ch. 28-Protists Monday, February 09, 2009 1:38 PM...

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Ch. 28-Protists Monday, February 09, 2009 1:38 PM Lecture Topic: 1. Clicker Question: Which type of horizontal gene transfer involves a pilus that makes direct contact between two cells? CONJUGATION 2. Protists a.Single celled and eukaryotic 3. Concept 28.1: Most eukaryotes are single-celled organisms 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 4. Protists are nutritionally diverse a.Photoautotrophs i.Contain chloroplasts, photosynthesize b. Heterotrophs i.Absorb organic molecules or ingest larger particles c.Mixotrophs i.Combine photosynthesis and heterotrophic nutrition 5. Endosymbiosis in Eukaryotic Evolution a.Much protist diversity has it origin in endosymbiosis b. c.Both underwent secondary endosymbiosis d. Fig. 28.2 6. Clicker question: Which of the following would be a key identifying characteristic of an organelle that has undergone secondary endosymbiosis? FOUR PLASMA MEMBRANES (not one or two) 7. Motility in Protists a.Flagellates i.Move by 1 or more flagellae b. Ciliates i.Move by coordinated movement of cilia c.Amoebae i.Move by means of pseudopodia d. Fig. 28.7 8. Sexual Reproduction in Protists a.Protists have a wide variety of life histories i.Zygotic life cycle 1. Haploid cells transform into gametes, gametes fuse to form zygotes 2. Ex: plasmodium, which causes malaria
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Ch.28 - Ch. 28-Protists Monday, February 09, 2009 1:38 PM...

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