W1L3 - Protists - Biol 5B: Organismal Biology Overview:...

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1 Biol 5B: Organismal Biology Spring ’09 WEEK 1; Lecture 3 Protist Life Cycles Overview: Protists • Structural and functional diversity • Endosymbiosis • Five supergroups • Life cycle of brown alga (an example of alternation of generations) • Life cycle of cellular slime molds (sexual and asexual reproduction) Structural and function diversity • Protists are eukaryotes and thus have organelles and are more complex than prokaryotes • Most protists are unicellular, but there are some colonial and multicellular species • Protists exhibit more structural and functional diversity than any other group of eukaryotes Structural and functional diversity • Protists, the most nutritionally diverse of all eukaryotes, include: – Photoautotrophs, which contain chloroplasts – Heterotrophs, which absorb organic molecules or ingest larger food particles Mixotrophs , which combine photosynthesis and heterotrophic nutrition Prorodon, a ciliate with symbiotic algae
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2 1 μm Cyanobacterium
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W1L3 - Protists - Biol 5B: Organismal Biology Overview:...

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