Bis102- MT1- W'03 KEY- Gasser

Bis102- MT1- W'03 KEY- Gasser - Name Last Instructions KEY...

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Name KEY BIS102-03, Winter '03, Page 1 of 7 Last, First C. S. Gasser Student Authorization: I, , authorize the University to distribute publicly this graded exam ( e. g. , handed out in class, or left in a bin for me to pick up). Signature Date BioSci 102-03 Jan. 30, 2003, First Midterm Instructions: There are seven pages in this exam including the cover sheet, please count them before you start to make sure all are present. Write your name on each page of the exam. Write your answers in the space provided below each question. If you need more space use the back of the page and indicate clearly that you have continued your answer on the back. Do not use additional paper. For calculation problems a clear line of calculations leading to your final answer must be shown to obtain full credit. Use the following pK a values for the exam. Amino Acid a -NH 2 a -COOH R-group log 1.0 = 0.00 Ala, Gly, Ile, Leu, Val 9.7 2.3 log 1.5 = 0.18 Asn, Gln 9.0 2.1 log 2.0 = 0.30 Met, Ser, Trp 9.3 2.3 log 2.5 = 0.40 Phe 9.1 1.8 log 3.0 = 0.48 Pro 10.6 2.0 log 3.5 = 0.54 Thr 10.4 2.6 log 4.0 = 0.60 Asp 9.8 2.1 3.9 log 4.5 = 0.65 Glu 9.7 2.2 4.2 log 5.0 = 0.70 His 9.2 1.8 6.0 log 5.5 = 0.74 Cys 10.8 1.8 8.3 log 6.0 = 0.78 Tyr, Lys 9.1 2.2 10.0 log 6.5 = 0.81 Arg 9.0 2.2 12.5 log 7.0 = 0.85 log 7.5 = 0.88 Question Value Score log 8.0 = 0.90 1 20 log 8.5 = 0.93 2 12 log 9.0 = 0.95 3 20 log 9.5 = 0.98 4 16 log 10.0 = 1.00 5 25 6 26 R = 8.3 X 10 - 3 kJ/K•mol 7 15 25°C = 298K 8 16 Total 150
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Name KEY BIS102-03, Winter '03, Page 2 of 7 Last, First C. S. Gasser 1. An important reaction of photosynthesis is the interconversion of the structural isomers Ribose- 5-Phosphate (R5P) and Ribulose-5-phosphate (Ru5P) according to the following reaction: Ru5P <––> R5P K eq '= 1.39 (@ 25°C) Answer the following questions. a) (6) Calculate the standard free energy change ( D G°') for this reaction at 25°C. D G ° ' = - RT lnK eq ' D G ° ' = - 8.3 10 - 3 298 ln1.39 D G ° ' = - 0.81 D G°' = -0.81 kJ/mol units b) (4) At equilibrium, which of the two compounds would be present at lower concentration?
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