Practice_Exam_III_ans - Sping 2004 BCHS 3304 Exam III...

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Sping 2004 BCHS 3304 Exam III Review- 1). How many different stereoisomers are possible for a 5-carbon ketose sugar? a). 2 b). 4 c). 8 d). 12 e). 16 : (b), there are 2 (5-3) stereoisomers for a 5-carbon ketose sugar. 2). A healthy living cell maintains an overall thermodynamic value such that: a). S ° ’ > 0 d). S ° ’ < 0 b). G ° ’ > 0 e). G ° ’ < 0 c). G ° ’ = 0 : (e), a healthy living cell maintains an overall thermodynamic value such that G ° ’ < 0. 3). For the reaction catalyzed by adenylate kinase: ATP + AMP  2 ADP The overall G ° 0 even though the cellular [AMP], [ADP], and [ATP] are far away from their equilibrium values. What is an alternative explanation for why this reaction operates with a G ° 0? a). Adenylate kinase is altering the equilibrium of the reaction. b). Adenylate kinase is lowering the activation energy of the reaction such that a new step in the mechanism has become rate-limiting. c). Adenylate kinase catalyzes its reaction at a diffusion-controlled limit. d). There is no net synthesis of high-energy phosphoanhydride bonds, they are only being rearranged. e). ATP hydrolysis makes this non-spontaneous reaction freely reversible with a G ° 0. : (d), there is no net synthesis of high-energy phosphoanhydride bonds, they are only being rearranged. 4). What happens if you add more enzyme to an enzyme-catalyzed reaction already operating at V max ? a). K M will decrease. b). No change. c). Observed rate will be faster. d). k cat will increase. e). Observed rate will be slower.
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: (c), the observed rate of reaction will be faster. 5). Which two answer choices are not characteristics of a committed step of a metabolic pathway? a). Lies far from equilibrium b). Sensitive to equilibrium pressures. c). Usually has a considerably negative G ° d). Usually highly regulated e). Often have very complicated reaction mechanisms. : (b) and (e) are not characteristics of metabolic pathways. 6). In enzyme catalysis, the proximity effect refers to: a). The effective increase in the concentrations of the reacting species by binding to the enzyme active site. b). The approach of a substrate to an enzyme. c). Close contacts made by neighboring enzyme monomers. d). The increase in energy produced by bringing two or more reactants into van der Waals contact. e). All of the above. : (a), the effective increase in the concentrations of the reacting species by binding to the enzyme active site. 7). Which of the heterocyclic anomers of D-glucopyranose is more stable than the other and why? : β -D-glucopyranose is more stable than α -D-glucopyranose because the β - anomer is able to accommodate all of its bulky, non-hydrogen ring substituents in the equatorial positions, whereas the α -anomer cannot. 8). What are the four methods of producing ATP (or its equivalent) in the body?
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This note was uploaded on 10/07/2010 for the course BCHS BCHS 3304 taught by Professor Legge during the Spring '09 term at University of Houston.

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Practice_Exam_III_ans - Sping 2004 BCHS 3304 Exam III...

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