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Unformatted text preview: P athways that H a rvest Chemical E ne rgy
Glucose Metabolism 1. Chemical energy is stored in covalent bonds 2. Similar to combustion: C6H 12O6 + 6O2 6CO2 + 6 H 2O + free energy 3. Glucose metabolism stores energy as ATP: ADP + P1 _ free energy A TP 4. H ighly exergonic: -686 kcal/mol Metabolic Pathways that Harvest Energy 1. All start from the sun PhotosynthesisGlucoseGlycolysisPyruvate (3-C molecule) [all anaerobic) 2. Then the following reactions depend on whether or not O2 i s present/not a. Aerobic i. Cellular respiration 1. Complete oxidation 2. Waste products: H 2O, CO2 3. Net energy t rapped per glucose: 32 ATP 4. The pyruvate goes under oxidation and into citric acid cycle then electron t ransport/ATP synthesis and filly CO2 + H 2O are the products b. Anaerobic i. Fermentation 1. Incomplete oxidation 2. Waste products: lactic acid, ethanol and CO2 3. Net energy t rapped per glucose: 2 ATP Redox Reaction (OilRig) 1. Reducing agent = oxidized 2. Oxidation agent = reduced 3. Most reduced state: Highest free energy 4. Most oxidized state: Lowest free energy 5. Methane (most reduced), Methanol, Formaldehyde, Formic acid, Carbon dioxide ( Most oxidized) Electron Car rier 1. NAD+ : most common and abundant 2. I t is to carry electron and becomes NADH 3. Very energetic 4. NAD + + H 2 +2e- N ADH 5. NAD H + H + ½ O2 N AD + H 2O Pyruvate Oxidation 1. Oxidized to acetate and then converted to acetyl CoA 2. Enzyme- pyruvate dehydrogenase complex a. Pyruvate + NAD+ + CoA + H+ Acetyl CoA + NADH + CO2 3. Acetyl CoA donates acetyl group to from citrate + + ...
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This note was uploaded on 03/23/2011 for the course BIO 1305 taught by Professor Eldridge during the Fall '08 term at Baylor.
- Fall '08