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Unformatted text preview: name ________________________________________ BICH 441 EXAM 1 February 16, 2006 An Aggie does not lie, cheat, or steal, or tolerate those who do. I swear on my honor as an Aggie that I have not received or given unauthorized aid on this exam, and I am not aware of others who have received or given unauthorized aid on this exam. signed _________________________________________________________ NO CALCULATORS! Before you begin, write your name on each page (there are 6 pages) and sign the Aggie Honor Code statement above. Information you may find useful in answering some of the questions: fructose-1,6-bisP + H 2 O fructose-6-P + P i G' = 13.3 kJ/mol 1,3-bisphosphoglycerate + H 2 O 3-phosphoglycerate + P i G' = 49.4 kJ/mol PEP + H 2 O pyruvate + P i G' = 62.2 kJ/mol glucose-6-P + H 2 O glucose + P i G' = 13.8 kJ/mol citrate isocitrate G' = +6.7 kJ/mol glucose-6-P fructose-6-P G' = +1.67 kJ/mol ATP + H 2 O ADP + P i G' = 30.5 kJ/mol R = 8.314 J/molK assume T = 25C Questions 1-16 (2 pts each). Enter your answer on your Scantron sheet. 1. G' for the reaction in glycolysis catalyzed by pyruvate kinase is: A. 31.7 kJ/mol B. 30.5 kJ/mol C. 31.7 kJ/mol D. 62.2 kJ/mol 2. G' for the reaction in the TCA cycle catalyzed by malate dehydrogenase is 29.7 kJ/mol. K' eq for this reaction is: A. 1.6 10 5 B. 5 C. 0.033 D. 6.2 10 6 3. Inside a cell, G for the reaction in the TCA cycle catalyzed by malate dehydrogenase is approximately 0 (compare to question 2). This is most likely because: A. malate dehydrogenase changes G for the reaction. B. the concentration of oxaloacetate in the cell is very low compared to the concentration of malate. C. the reaction is coupled to ATP hydrolysis. D. the reaction is coupled to ATP synthesis. 4. K' eq for the reaction in the TCA cycle catalyzed by fumarase is 4.6. G' for this reaction is: A. 140 kJ/mol B. 22 kJ/mol C. 4 kJ/mol D. 5 kJ/mol 5. Glucose labeled with 14 C in the C-6 position is converted to acetyl-CoA by glycolysis and the pyruvate dehydrogenase complex. The resulting acetyl-CoA will contain: A. no 14 C. B. 14 C in the carboxyl group of acetyl-CoA. C. 14 C in the methyl group of acetyl-CoA. D. 14 C in both the carboxyl and methyl groups of acetyl-CoA. name ______________________________________ 2 6. Glucose labeled with 14 C in the C-5 position is converted to acetyl-CoA and enters the TCA cycle. What fraction of the 14 C label will be present in oxaloacetate after one complete turn of the cycle?...
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This note was uploaded on 03/27/2010 for the course BICH 441 taught by Professor Staff during the Spring '08 term at Texas A&M.
- Spring '08