Lecture 2.5 - A+B C+D G 0 = G f [C+D] - G f [A+B] If G...

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Unformatted text preview: A+B C+D G 0 = G f [C+D] - G f [A+B] If G <0 exergonic If G >0 endergonic BIOENERGETICS Catalysis and enzymes E + S E-S E + P Fig. 3-18 Gentle denaturation; urea Active protein Harsh denaturation; 100C Inactive Inactive Cool Inactive Active protein Remove urea; reactivation Oxidation: removal of an electron (or electrons) from a substance Reduction: addition of an electron (or electrons) to a substance Oxidation-Reduction Reactions Energy conservation in cells involves oxidation-reduction reactions Reduction addition of electron(s) Oxidation removal of electron(s) Fig. 5-10 (1) (2) (3) Redox couple E (V)-0.60 +0.10-0.50-0.40-0.30-0.20-0.10 +0.20 +0.30 +0.40 +0.50 +0.60 +0.70 +0.80 +0.90 0.0 (1) H 2 + fumarate 2- succinate 2- 2 3- 2- 2 (3) H + O H O 1 2 G = 237 kJ G 0 = 86 kJ Fig. 5-11 NADH + H + NAD + Oxidized Reduced Adenine Ribose Ribose Nicotinamide Phosphate added in NADP + Fig. 5-12 Electron donor oxidized NADH Electron donor NAD + Active site NADH Electron acceptor reduced Enzyme substrate complex NAD + Electron acceptor Enzyme II NADH binding site Reaction 2. Enzyme II reacts with electron acceptor and reduced form of coenzyme, NADH. Reaction 1. Enzyme I reacts with electron donor and oxidized form of coenzyme, NAD + ....
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Lecture 2.5 - A+B C+D G 0 = G f [C+D] - G f [A+B] If G...

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