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Protists Notes Updated

1 endosymbioc theory the hypothesis that certain

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Unformatted text preview: m embryos •  Can have complex life cycles Mo)lity •  Pseudopodia –  “False foot” –  Cytoplasmic projec)ons –  Extends, reversibly contracts •  Flagella –  Whip like structure –  Undulates or lashes –  9+2 arrangement of microtubules •  Cilia –  “Eyelash” –  Structure iden)cal to eukaryo)c flagella –  Length is shorter –  Several beat or wave in unison 3 2/4/14 Pro)sts Table 14.1 Endosymbio)c Theory •  •  •  The hypothesis that certain organelles originated as symbio)c prokaryotes that lived inside other, free- living prokaryo)c cells Eukaryotes formed from union of small aerobic prokaryotes with larger anaerobic prokaryotes Smaller prokaryotes became internal parasites –  Parasites lost ability to exist independently –  Larger cell became dependent on parasites for aerobic ATP produc)on –  Aerobic prokaryotes evolved into mitochondria –  Chloroplast evolved though several endosymbio)c events (secondary endosymbiosis) •  Pro)sts thought to have been the first eukaryotes Endosymbio)c Theory •  Evidence –  rRNA suggest that purple bacteria were the ancestors of mitochondria –  Chloroplast and mit...
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