B1510_F07_metabolic_evolution_diversity

B1510_F07_metabolic_evolution_diversity - Georgia Tech...

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Biology 1510 Georgia Tech School of Biology Fall 2007 Evolution & Diversity of Energy Metabolism What were the first metabolic pathways that evolved in the first cells or proto-cells? How can life flourish in the absence of oxygen or light? What is the diversity of microbial energy metabolism?
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Biology 1510 Georgia Tech School of Biology Fall 2007 Q: An organism that fixes CO 2 , lives deep in a cave, and oxidizes ammonia for energy would be: a) A chemoheterotroph b) A photoheterotroph a) A chemoautotroph- a) A photoautotroph- plants that fixes CO2
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Biology 1510 Georgia Tech School of Biology Fall 2007 What pathways were present in the last universal common ancestor? Glycolysis & fermentation: old and inefficient - limiting energy yield higher -lower organic carbon. Electron transport chain & chemiosmotic ATP synthesis:high energy yield
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Biology 1510 Georgia Tech School of Biology Fall 2007 Q: What may have been the energy source for the first cells or proto-cells? a) Sunlight-excited pigment molecules as electron donor, oxygen as electron acceptor (plants) b) Organic chemicals as electron donor, oxygen as electron acceptor (chemoheterotroph) c) Sunlight-excited pigment molecules as electron donor, oxidized pigment molecules as electron acceptor a) Inorganic chemicals as electron donor, minerals as electron acceptor (chemoautotroph)
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Biology 1510 Georgia Tech School of Biology Fall 2007 Chemoautotrophic Pathways Reaction Name* C Pathway Aerobic Ammonia oxidation NH 4 + + 2O 2 v ΝΟ 3 - + + + Η 2 Ο Χαλωιν Μετηανεοξιδατιον ΧΗ 4 + 2 ΧΟ 2 + 2 Ο ΡΜΠ Μν Οξιδατιον 2Μν 2+ 2 + 2 Ο 2ΜνΟ 2 + + Χαλωιν ΦεΟξιδατιον 2Φε 2+ 2 + 10Η 2 Ο 4Φε(ΟΗ29 3 + + Χαλωιν ΣυλφιδεΟξιδατιον Η 2 Σ + 2 ΣΟ 4 2- + + Ρ-ΤΧΑ,Χαλωιν Η Οξιδατιον 2 2 2 Ο Ρ-ΤΧΑ,Χαλωιν Αναεροβιχ ∆ενιτριφιχατιον 2ΝΟ 3 - + 2 Ν 2 + 2 Ο+ 2ΟΗ - Χαλωιν,Α -ΧοΑ ΦεΡεδυχτιον 2ΦεΟΟΗ +
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B1510_F07_metabolic_evolution_diversity - Georgia Tech...

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