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Week 4 Notes

10 12714 amoebozoa plasmodial slime molds single

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Unformatted text preview: esis– The role of secondary endosymbiosis Are symbio;c interac;ons really that likely? •  Symbio;c organisms (unicellular eukaryotes and chemoautotrophs) from the Santa Barbara Basin •  Anaerobic bacteria generate large amounts of H2S •  Oxygen is scarce, and inhibits many respira;on reac;ons within mitochondria •  Surrounding bacteria metabolize the H2S, protects the host from the harsh environment. 8 1/27/14 Evolu;on of Pro;st Lineages When did pro;sts arise? 9 1/27/14 Lineages of Pro;sts Molecular Phylogenies •  Two major divisions –  Unikonta –  Bikonta •  What do direct sequencing studies tell us? 10 1/27/14 Amoebozoa – Plasmodial slime molds •  Single super- cell •  Important in the carbon cycle as decomposers (along with bacteria) in certain ecosystems •  Produce haploid spores that fuse and form diploid organism Excavata •  Free- living, parasi;c, or symbio;c •  Have a cytoskeleton, and flagella Giardia 11 1/27/14 Plantae •  Cell walls of cellulose •  Most are photosynthe;c •  Agar Rhizaria •  Their shells have holes •  Fossil record spans ~350 million years •  CaCo3 shells •  Feed with...
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