19 Protista I - Lecture 19 Protista May 1 2007 The origin...

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Unformatted text preview: Lecture 19: Protista May 1, 2007 The origin of eukaryotes Serial endosymbiosis • The Protista - paraphyletic – Benthic life style • Life in the inter-tidal zone • Life in the sub-littoral zone – Planktonic life • Generalized life cycles • Algal groups – Dinophyta, Bacillariophyta Evolutionary relationships • The Protista are a diverse assemblage within the Eukarya Bacteria Archaea Animals Fungi Plants Rest are the PROTISTA Eukarya The Protista Protista Monera Stromatolites 2.7 BY Earth 4.5 BY Life 2.7 BY Iron oxides 2.7 BY - O 2 Vascular Fossils 0.4 BY Cyanobacteria: Gram negative - less peptidoglycan, less sensitive to antibiotics, stain pink Bhattacharya et al.(2004). Bioessays 26:50-60 Primary, secondary, and tertiary endosymbioses Red, Green, Diatom.. Sec or Tertiary Dinofagellates Red Alga Secondary Brown Algae Cyanobacterium Primary Green Algae Cyanobacterium Primary Red Algae A. Evidence to support this: i. Double membrane around organelles. The mt inner membrane resembles prokaryotic membranes, not eukaryotic membranes ii. Mitochondria and chloroplasts have their own ribosomes and the size matches that of bacterial ribosomes, not Eukaryotes iii. DNA. Circular chromosome, like bacteria. DNA sequences are more closely related to Bacteria than Eukarya iv. Division by binary fission like Bacteria...
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19 Protista I - Lecture 19 Protista May 1 2007 The origin...

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