311C S12 L9OL - Cellular Energy Transformations: Harvesting...

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Unformatted text preview: Cellular Energy Transformations: Harvesting Energy Harvesting Chemical Energy • Catabolic pathways release chemical energy that can be used to make ATP Figure 8.11 Energy added from catabolism (exergonic, energy-releasing processes) Energy released for cellular work (endergonic, energy-consuming processes) ATP ADP P i H 2 O ATP Cycle Catabolic Pathways • Anaerobic energy harvesting pathways – Fermentation • Aerobic energy harvesting pathways – Cellular (aerobic) Respiration • Yield energy by oxidizing organic fuels Redox Reactions: Oxidation and Reduction • Chemical reactions involving the transfer of electrons from one reactant to another – Oxidation: – Reduction: – Oxidation and reduction always go together Redox Reactions Redox and Energy Figure 9.UN03 becomes oxidized becomes reduced Redox Reactions: Oxidation of Organic Fuel Molecules • Electrons lose potential energy along the way and energy is released • Break down glucose and release energy in a series of steps – NAD – Electron transport chain Redox Reactions: Stepwise Harvesting of Energy Step-wise energy release Figure 9.4 Nicotinamide (oxidized form) NAD + (from food) Dehydrogenase Reduction of NAD + Oxidation of NADH Nicotinamide (reduced form) NADH NAD is an electron carrier • Nicotinamide adenine dinucleotide • High-energy e- carrier • Catalyzed by dehydrogenases NAD is an electron carrier NAD is an electron carrier NAD is an electron carrier Fig. 9-5 F r e e e n e r g y , G F r e e e n e r g y , G (a) Uncontrolled reaction H 2 O H 2 + 1 / 2 O 2 Explosive release of heat and light...
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This note was uploaded on 04/02/2012 for the course BIO 311C taught by Professor Satasivian during the Spring '08 term at University of Texas.

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311C S12 L9OL - Cellular Energy Transformations: Harvesting...

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