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THE ENDOSYMBIOTIC THEORY

Figure 27.12. Pyruvate and O 2. ATP. THE ENDOSYMBIOTIC THEORY. Reduced carbon compounds. Electron transport. High ATP yield. + O 2. chain. Fermentation. Reduced carbon compounds. Low ATP yield. Aerobic bacterium. Anaerobic eukaryote. 1. Eukaryotic cell surrounds

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THE ENDOSYMBIOTIC THEORY

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  1. Figure 27.12 Pyruvate and O2 ATP THE ENDOSYMBIOTIC THEORY Reduced carbon compounds Electron transport High ATP yield + O2 chain Fermentation Reduced carbon compounds Low ATP yield Aerobic bacterium Anaerobic eukaryote 1. Eukaryotic cell surrounds and engulfs bacterium. 2. Bacterium lives within eukaryote cell. 3. Eukaryote supplies bacterium with reduced carbon compounds. Bacterium supplies eukaryote with ATP.

  2. The first animals (metazoans) • They did not appear until about 600 million years ago • But they rapidly radiated - the Cambrian explosion

  3. Hallucigenia

  4. Opabinia - Burgess Shale

  5. Opabinia - Burgess Shale

  6. Wiwaxia - Burgess Shale

  7. Wiwaxia - Burgess Shale

  8. Yohoia - Burgess Shale

  9. Marrella - Burgess Shale

  10. Marrella - Burgess Shale

  11. Anomalocaris - Burgess Shale

  12. Choanoflagellata

  13. Porifera - sponges

  14. Collar cell of a sponge

  15. Cnidaria - anemones

  16. Cnidaria - jellyfish

  17. Cnidaria - corals

  18. Ctenophora - comb-jellies

  19. Brachiopoda - lamp shells

  20. Echinodermata

  21. Hemichordata - acorn worms

  22. Chordata - sea squirts, lancelets, vertebrates

  23. Platyhelminthes - flatworms

  24. Nemertea - ribbon worms

  25. Mollusca

  26. Annelida - segmented worms

  27. Annelida - earthworm

  28. Annelida - polychaetes

  29. Arthropoda - arachnids

  30. Arthropoda - crustaceans

  31. Arthropoda - insects

  32. Arthropoda - centipedes and millipedes (myriapods)

  33. Onychophora - velvet worms

  34. Nematoda - roundworms

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