lec 9 - Prokaryotic & Archaea: Themes of Diversity...

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Unformatted text preview: Prokaryotic & Archaea: Themes of Diversity Chapter 27 Chapter 27: Things to Examine Diseases Bioremediation Extremophiles Global Change (revisited later today and in the semester) Nitrogen Cycle and "Dead Zones" Fig 27.11: Morphological Diversity Fig 27.12 Fig 27.12 Metabolic Diversity Producing ATP Substrate - level phosphorylation e.g., glycolysis and fermentation Redox reactions and electron transport Metabolic Diversity Autotrophs Synthesize organic compounds Heterotrophs Utilize organic compounds made by autotrophs Metabolic Diversity: exciting e- to the top of e- transport chains Phototrophs Use light energy to excite e- Organotrophs Oxidize organic molecules which serve as edonors Exergonic ( - G) reactions Lithotrophs Oxidize inorganic molecules (e.g., CH4 or NH3) which donate e- What picks up ~ e ? First acceptor in e- transport chain NAD+ + 2e- <---> NADH + H+ NADP+ + 2e- <---> NADPH + H+ FAD + 2e- <---> FADH2 Electron transport chains Let's Demonstrate! How do e- transport chains generate ATP? Passed along protein chain Localized and organized in membrane e- changes shape Protons (H+) pumped creating C and E POTENTIAL ENERGY Protons then move through ATP synthase to make ATP It changes shape to bring ADP + Pi together Chemiosmotic Synthesis Fig 27.13: Phototrophs Fig 27.13: Phototrophs Sources of C for Autotrophs CO2 CH4 CO (!!!) CH3OH C fixation via Calvin Cycle and at least 3 other pathways Table 27.4: e acceptors ...
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This note was uploaded on 04/22/2008 for the course BSCI 207 taught by Professor Higgins during the Spring '08 term at Maryland.

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lec 9 - Prokaryotic & Archaea: Themes of Diversity...

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