BCH_3023_Summer_2011_Exam_1_Answer_Key

BCH_3023_Summer_2011_Exam_1_Answer_Key - Introductory...

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Introductory Biochemistry, BCH 3023 - Summer 2011 EXAM #1: June 27, 2011 Name: _________________________________________ Useful Constant: Gas constant, R = 8.315 J/mol-K 1. The role of an enzyme in an enzyme-catalyzed reaction is to: A. bind a transition state intermediate, such that it cannot be converted back to substrate. B. ensure that all of the substrate is converted to product. C. ensure that the product is more stable than the substrate. D. increase the rate at which substrate is converted into product. E. make the free-energy change for the reaction more favorable. 2. An antibody binds to an antigen with a K d of 1.0 × 10 -7 M. At what concentration does θ equal 0.5? A. 5.0 μ M B. 1.0 μ M C. 10.0 μ M D. 5.0 nM E. 100 nM 3. The uncommon amino acid selenocysteine has an R group with the structure —CH 2 —SeH (pK a = 5.0). In an aqueous solution at pH = 7.0, selenocysteine would: A. be a fully ionized zwitterion with no net charge. B. be found in proteins as D -selenocysteine. C. never be found in a protein. D. be nonionic. E. not be optically active. 1
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Introductory Biochemistry, BCH 3023 - Summer 2011 EXAM #1: June 27, 2011 Name: _________________________________________ 4. An allosteric interaction between a ligand and a protein is one in which: A. binding of a molecule to a binding site affects binding of additional molecules to the same site. B. binding of a molecule to a binding site affects binding properties of another site on the protein. C. binding of the ligand to the protein is covalent. D. multiple molecules of the same ligand can bind to the same binding site. E. two different ligands can bind to the same binding site. 5. Which of the following statements about a plot of v vs. [S] for an enzyme that follows Michaelis-Menten kinetics is false ? A. As [S] increases, the initial velocity of reaction, v, also increases. B. At very high [S], the velocity curve becomes a horizontal line that intersects the v-axis (y-axis) at K M . C. K M is the [S] at which v = 1/2 V MAX . D. The shape of the curve is a hyperbola. E. The y-axis is a rate term with units of M/min. 6. To calculate the turnover number of an enzyme, you need to know: A. the enzyme concentration. B. the initial velocity of the catalyzed reaction at [S] >> K M .
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This note was uploaded on 07/01/2011 for the course BCH 3023 taught by Professor Harmon during the Spring '10 term at University of South Florida.

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BCH_3023_Summer_2011_Exam_1_Answer_Key - Introductory...

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