CHEM 153A Study Guide - Final Guide: Electrochemical Gradient, Citric Acid Cycle, Stoichiometry
14 Jun 2016
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Find delta e and deltago" for the oxidation of nadh by o2. Nadh + h+ + 1/2o2 <=> h2o + nad+ Oxi: nad+ h+ + 2e- > nadh -0. 315. Red: o2 + 2h+ + 2e- -> h2o 0. 815. Deltae = e(acceptor) e(donor) = 0. 815 (-0. 315) = 1. 13v. Change in deltae: inherent characteristic of the reaction i. e. always constant because the reduction potential is never changed. No matter how many times the reactions are catalyzed. But: deltag = -4*96. 5*1. 13 = -436kj/mol (if catalyzed the reaction twice in the tca cycle) If oxidation by 1 full o2, then 4 electrons are transferred. Is a electrical gradients the protons are charges. From low [] to high [] = need e = positive deltag. Dissipating proton gradient leads to negative delta g = move from high to low [] = favorable step. Complex i. iii, iv can pump protons back into the intermembrane space.
