BMB200 Exam 3 FS15 answer key 29. 12 pts total: 6 pts: Principles of catabolism + 2 pts. Identifying that PDH is a catabolic process. +2 pts each for up to two catabolic principles: Oxidation of carbon, convergence on common intermediates, breakdown of complex molecules and exergonic reactions. 4 pts: linking principles to actual reactions +2 pts each: showing how a reaction in the PDH demonstrates priniciple listed in first part. Ex. NAD+ is reduced during the PDH to NADH; reduction reactions must be coupled to oxidation reactions, in this case the oxidation of C in pyruvate. This shows the principle of carbon oxidation. Number Form A Form B Form C Form D 1 B A B A 2 A A A A 3 A A B A 4 D E C A 5 D C B D 6 B A E B 7 C B B B 8 C C C A 9 E A A B 10 C D B A 11 D C D D 12 D B B (Not scored) A 13 A Not scored A E 14 A B A A 15 B C C D 16 D (Not scored) A D C (Not scored) 17 D A B C 18 B D B D 19 C D D A 20 D B D A 21 D C C E 22 A C E D 23 A A D C 24 C C D C 25 C B A E 26 D C E D 27 B D B C 28 E B A BEx. Acetyl-CoA is produced by the PDH; acetyl-CoA is a point of convergence between catabolic pathways and can be used by the citric acid cycle. 2 pts: correct and appropriate course vocabulary. 30. 18 pts total. a) +4 pts: Correct net reaction: Malate + Fumarate  oxaloacetate and succinate b) +2 pts EACH In this reaction, fumarate gets reduced. In this reaction, malate gets oxidized. ****You could earn partial credit if you had the wrong Part A eqn, but still describe redox correctly for the reaction you wrote. c) +4 pts. Delta E = 0.197 ****You could earn partial credit if you had the wrong Part A eqn, but still calculated E correctly for the reaction you wrote. d) +6 pts. For full credit you need to relate ∆E to ∆G. This reaction is likely favorable in the cell. A positive reduction potential gives a negative free energy value based on the equation: ∆G = -nF∆E . Negative free energy values are spontaneous and likely to occur in a cell. ***You could earn full credit for this part if you correctly related your E value in Part C to free energy using the above