BIS103_08MT2%20Key_

BIS103_08MT2%20Key_ - BIS103-002(Spring 2008 Midterm#2(May...

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BIS103-002 (Spring 2008) Midterm #2 (May 20) Name_____________________________________ 1 Instructor: Abel Student ID #____________ ANSWER KEY Pls., check appropriate box below. This exam consists of 6 questions. A maximum of 100 points can be earned. Partial credit will be given. There are a total of 13 pages, including the cover page and one blank sheet at the end for notes. However, do not use the blank sheet for your final answers. If you need more space, use the back of pages 2-12. Write your name on top of each page! Petitions for re-grading will be considered only if you have used permanent ink , unless an addition error has occurred. *IT IS YOUR RESPONSIBILITY TO WRITE LEGIBLE! No extra effort will be made to decipher your handwriting. T = 25 o C (298 K) T = 37 o C (310 K) R = 8.315 J mol -1 K -1 F = 96.5 kJ mol -1 V -1 n = equivalents of electrons Z = charge of proton Δ G o’ = – RTlnK eq Δ G = Δ G o ’ + RTln[Prod.]/[React.] Δ G = Δ G o ’ + 2.303RT Δ pH + ZF ΔΨ Δ G o’ = – nF Δ E o’ Δ E o’ = E o’ Oxidant – E o’ Reductant I,_______________________________________, authorize the University to distribute publicly this graded exam (e.g., handed out in class or left in a bin for pick up). I am aware of the fact that violations of the Academic Code of Conduct 1 may be reported to UC Davis Student Judicial Affairs. 1 Examples of academic misconduct include: receiving or providing unauthorized assistance on examinations, using unauthorized materials during an examination, altering an exam and submitting it for re-grading, or using false excuses to obtain extensions of time ( http://sja.ucdavis.edu/cac.htm ). Signature________________________________________ Date____________________________ Undergraduate Student Completing Incomplete Open Enrollment Student Graduate Student Question Value Score 1 22 2 10 3 24 4 12 5 10 6 22+2 TOTAL 100 (+2)
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BIS103-002 (Spring 2008) Midterm #2 (May 20) Name_____________________________________ 2 1. (22 pts) Questions related to the Tricarboxylic Acid (TCA) or Citric Acid cycle. a) The TCA cycle is sometimes referred to as an “amphibolic” pathway. Briefly explain why. (2 pts) The TCA cycle simultaneously serves two major functions: In its catabolic mode, products of carbohydrate, lipid or amino acid degradation, most prominently acetyl-CoA, are completely degraded to CO 2 and NADH/FADH 2 . At the same time, the TCA cycle also provides the starting building blocks (also called ‘precursors’) for a number of anabolic (or biosynthetic) pathways and reactions. b) Briefly explain the purpose of the “anaplerotic reactions” . (2 pts) The purpose of the anaplerotic reactions is to maintain a minimal concentration of the TCA cycle intermediate oxaloacetate (OAA) to enable its catabolic function (degradation of acetyl-CoA) when other intermediates, including OAA, are withdrawn from TCA cycle reactions for biosynthetic purposes (e.g. OAA Î glucose or citrate Î fatty acids). c) Provide
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BIS103_08MT2%20Key_ - BIS103-002(Spring 2008 Midterm#2(May...

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