10 - 1 Eukaryotic Diversity I 1. Optional review sessions...

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Unformatted text preview: 1 Eukaryotic Diversity I 1. Optional review sessions for 1st mid-term exam Wednesday 10-12, 2242 HJ Patterson Friday 3-4:30, Room TBD Bring your questions! 2. GSS sessions TH at 5-6 in PHYS 1402 3. Todd office hours at review session today 4. Use your study group to prepare for first mid- term 5. Monday first mid-term exam on all lectures from Intro to Bioenergetics (not today or Fri;) bring a calculator if needed C & R 28.1 Principles of Eukaryotic Diversity C & R 28.1 Eukaryotes evolved as complex assemblages of several organisms Endosymbiosis the uptake of another organism and its evolution into an organelle. (Focus of Fridays discussion) Eukaryotes acquired aerobic respiration and oxygenic photosynthesis from bacterial endosymbionts. Prokaryotes lateral gene transfer Eukaryotes endosymbiosis (with internal LGT) Unifying features include: nucleus, sexual life cycle, endomembrane system, and complex cytoskeleton. Eukaryotes originated the sexual stages, i.e., syngamy and meiosis, in life cycles. Eukaryotes manifest more organellar, cellular, and multicellular diversity than prokaryotes. Patterns of Eukaryote Diversity (In Brief) Three Groups for us - Freeman Fig. 29.8 1 2 3 Protists - paraphyletic group all eukaryotes except plants, fungi, and animals 1 ) Basal groups - excavates 2 ) Heterotrophic groups 3 ) Photosynthetic groups Origins of Eukaryotic Bioenergetics What process did the earliest organisms use for their energy? energy process? oxygenic photosyn. aerobic respiration 2 Making ATP What if no O 2 is available? Could use another electron acceptor in ETC (prokaryotes only), or Fermentation (9.12) Much lower yield! Freeman Fig. 29.11 Protist unity: Mitochondrion Origin Primary Endosymbiosis- an -proteobacterium was engulfed by a eukaryote Evidence: 1. Morphological similarity of -proteobacterium and mitochondrion. 2. Similar information processing e.g., 70S ribosomes. 3. Mitochondrial genomes are organized as circular DNA molecules Freeman Fig. 29.12 Protist unity: Mitochondrion Origin Primary Endosymbiosis- an -proteobacterium was engulfed by a eukaryote Evidence: 1. Morphological similarity of -protobacterium and mitochondrion. 2. Mitochrondia have 70S ribosomes. 3. Mitochondrial genomes are organized as circular DNA molecules 4. Phylogenetic data Principles of Eukaryotic Diversity C & R 28.1 Eukaryotes evolved as complex assemblages of several organisms Endosymbiosis the uptake of another organism and its evolution into an organelle. (Focus of Fridays discussion) Eukaryotes acquired aerobic respiration and oxygenic photosynthesis from bacterial endosymbionts....
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10 - 1 Eukaryotic Diversity I 1. Optional review sessions...

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