chee370_as2 - CHEE370HomeworkAssignment#2 #1

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CHEE-370 Homework Assi gnment #2     #1                  Ordered from most energy-yielding (top) to least energy-yielding (bottom): Series Reduction potentials (V) ∆E 0   (V) Comments H 2 /O 2 -0.42 and +0.82 1.24 H 2 S/O 2 -0.28 and +0.82 1.10 methanol/NO 3 -    -0.38 and +0.42 0.80 producing NO 2 - H 2 S/NO 3 - -0.28 and +0.42 0.70 producing NO 2 - Fe 2+ /O 2   +0.2 and +0.82 0.62 Iron at pH 7 H 2 /Fe 3+ -0.42 and +0.2 0.62 Iron at pH 7 NO 2 - /Fe 3+ +0.42 and +0.76 0.34 Iron at pH 2    #2                  cytochrome c E 0 ’ = +0.23V ubiquinone E 0 ’ = +0.113V cytochrome c E 0 ’ = -0.29V cytochrome aa E 0 ’ = +0.385V ferredoxin  E 0 ’ = -0.39V H (-0.42V) as electron donor  SO 4 2-  (-0.22V) as electron acceptor The H 2  redox couple has a reduction potential of -0.42V, whereas the one of SO 4 2-  couple is -0.22V. In order to  exist in this electron transport chain, a component has to have a reduction potential in the range of these two bounds.  In case of a lower potential value, H 2  can no longer be the initial electron donor, while a higher potential value  would not allow SO 4 2-  to be the final electron acceptor in such chain. With this being said, only  cytochrome c 3  (-0.29V)  and  ferredoxin  (-0.39V) can exist in this chain, whereas  ubiquinone  (+0.113V),  cytochrome c  (+0.23V) and  cytochrome a (+0.385V) cannot since their E 0 ’ values are well out of the range.  #3                 
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Fermentation - ATP Synthesis per glucose molecule: - Conv. Glucose to Glucose 6-P and Fructose-6-P to Fructose-1,6, biphosphate       -2 ATP - Conversion of 1,3-bisphosphoglyceric acid to 3-phosphoglyceric acid  2 ATP - Conversion of phosphoenolpyruvate to pyruvate  2 ATP - Net gain 2 ATP Respiration (Glycolysis) - ATP Synthesis per glucose molecule: - Substrate-level phosphorylation  2 ATP - Oxidative phosphorylation of 2 NADH 6 ATP - Net gain 8 ATP The   electron   transport   chain   (ETC)   and   consequential   proton   motive   force   (PMF)   occurring   across   the  mitochondrial membrane output a total of 30 ATP per glucose molecule. Precisely, the following are formed from the  products of the citric acid cycle (CAC):  - 1 GTP yields 1 ATP through substrate-level phosphorylation 
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This note was uploaded on 12/01/2009 for the course CHEM ENG CHEE 370 taught by Professor Tufenkji,jones during the Fall '09 term at McGill.

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chee370_as2 - CHEE370HomeworkAssignment#2 #1

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