Harvesting Chemical Energy 2008

Harvesting Chemical Energy 2008 - Chapter 9 Harvesting...

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Chapter 9 – Harvesting chemical energy What pathways capture chemical energy for cellular work? What are the inputs and outputs for each pathway? Where in the cell are these pathways located? Under what conditions do these pathways operate? How are these pathways regulated? How do these pathways connect with the rest of cellular metabolism?
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Cellular Energy Pathways photosynthesis C arbohydrates ( C H 2 O) Respiration Fermentation glycolysis glycolysis + fermentation light energy , C O 2 , H 2 O mitochondria C O 2 + H 2 O + ATP C OH byproduct + ATP cytosol pyruvate + NADH pyruvate oxidation TCA cycle, oxidative phosphorylation + O 2 ATP
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Energy metabolism in prokaryotes Glycolysis Fermentation Citric acid cycle NAD + NADH ATP Electron donors {[CH 2 O], H 2 , H 2 S, CH 4 , Fe 2+ , etc.} Terminal electron acceptors O 2, NO 3 - , SO 4 2- , Mn 4+ , Fe 3+ , CO 2 , etc. H + electrochemical gradient Pyruvate oxidation Electron transport chain ATP ADP
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Free energy, G (a) Uncontrolled reaction H 2 O H 2 + 1 / 2 O 2 Explosive release of heat and light energy (b) Cellular respiration Controlled release of energy for synthesis of ATP 2 H + + 2 e 2 H + 1 / 2 O 2 (from food via NADH) ATP 1 / 2 O 2 2 H 2 e Electron transport chain becomes oxidized becomes reduced
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Proton gradient across the plasma membrane drives chemisosmotic ATP synthesis (oxidative phosphorylation) and other reactions in prokaryotes Fenchel 2002, Fig 6.2
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Eukaryotes Prokaryotes Cytoplasm Glycolysis Fermentation Cytoplasm Glycolysis Fermentation Pyruvate oxidation Citric acid cycle Mitochondria Inner membrane
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This note was uploaded on 09/04/2009 for the course BIO 1510 taught by Professor Unknown during the Spring '07 term at Georgia Institute of Technology.

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Harvesting Chemical Energy 2008 - Chapter 9 Harvesting...

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