CHEM153A_final_L1_W09

CHEM153A_final_L1_W09 - Chem 153A, Winter 2009, Final Exam...

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Chem 153A, Winter 2009, Final Exam 1A Answer Sheet 1 (Gold) 2/11 1. (1 pt) Write your exam ID ( A ) in the blank at the upper right of your answer sheet. 2. (12 pts) Given the following metabolic pathway (as it occurs in the cell): a. Would you expect enzyme 1 to be regulated? Explain why in 15 words or less. b. If you answered ‘yes’ to part a , name a molecule that you would expect to act as a positive effector. Name a molecule that you would expect to act as a negative effector. (If you answered ‘no,’ write NA.) c. Would you expect enzyme 2 to be regulated? Explain why in 15 words or less. d. If you answered ‘yes’ to part c , name a molecule that you would expect to act as a positive effector. Name a molecule that you would expect to act as a negative effector. (If you answered ‘no,’ write NA.) e. For the remaining enzymes (3-9), which would you expect to be regulated? List their numbers. 3. (5 pts) True or False? a. Hexokinase has a higher affinity for glucose than glucokinase. b. Hexokinase changes conformation on substrate binding. c. Hexokinase is a lyase. d. Hexokinase is regulated by substrate availability. e. Glucokinase is a multi-subunit protein. 4. (5 pts) a. Define ‘isozyme’ (10 words or less). b. True or False? Glucosephosphate isomerase and triosephosphate isomerase are isozymes. 5. (5 pts) Which of the following catalytic mechanisms are important in the isomerization of glucose-6-phosphate to fructose-6-phosphate: a. general acid catalysis b. general base catalysis c. covalent catalysis d. electrostatic catalysis e. metal-ion catalysis
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Chem 153A, Winter 2009, Final Exam 1A Answer Sheet 1 (Gold) 3/11 6. (8 pts) Which of the following enzymes can bind ATP? a. hexokinase b. glucokinase c. glucosephosphate isomerase d. phosphofructokinase-1 e. phosphoprotein phosphatase f. phosphofructokinase-2, phosphorylated form g. aldolase h. triosephosphate isomerase i. glyceraldehyde-3-phosphate dehydrogenase j. phosphoglycerate kinase k. phosphoglycerate mutase l. enolase m. pyruvate kinase n. pyruvate dehydrogenase complex o. pyruvate dehydrogenase kinase p. citrate synthase q. aconitase r. isocitrate dehydrogenase s. α-ketoglutarate dehydrogenase complex t. succinyl-CoA synthetase u. succinate dehydrogenase v. fumarase w. malate dehydrogenase x. flavoprotein dehydrogenase y. 3-phosphoglycerol dehydrogenase z. ATP synthase 7. (5 pts) An aspiring chef, you decide to try making sauerkraut (sour cabbage) at home. The recipe tells you to tightly pack the shredded & salted cabbage into a container that will not let in air. The container is then left to sit, during which time the cabbage acquires its sour taste. a. Name the process that causes the cabbage to sour, and the compound produced by this process. b.
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This note was uploaded on 03/02/2010 for the course CHEM CHEM153A taught by Professor Nelson during the Winter '10 term at UCLA.

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CHEM153A_final_L1_W09 - Chem 153A, Winter 2009, Final Exam...

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