Chapter 28

Chapter 28 - Chapter 28 Protists 1 Protists are an...

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Chapter 28 Protists – February 11, 2008 1) Protists are an extremely diverse assortment of eukaryotes a) Protists are far more diverse than all other eukaryotes i) No longer considered a single kingdom b) Mostly unicellular, but some colonial and multicellular forms c) Reproduces sexually and asexually 2) 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 3) Endosymbiosis in Eukaryotic Evolution a) Much protist diversity has its origin in endosymbiosis b) Plastid-bearing lineage evolved into red and green algae c) Both underwent secondary endosymbiosis 4) Euglenozoans have flagella with a unique internal structure a) Euglenozoa includes heterotrophs, photosynthetic autotrophs, and parasites b) Main feature is a spiral or crystalline rod of unknown function inside their flagella c) Kinetoplastids i) Single, large mitochondrion containing an organized mass of DNA called a
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Chapter 28 - Chapter 28 Protists 1 Protists are an...

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