Exam2-key-07 - CH 369 Exam 2 Multiple Choice - Spring 2007...

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CH 369 Exam 2 Multiple Choice - Spring 2007 1. Which statement is NOT true of the heme group of myglobin? a. It absorbs light in the visible spectrum. b. It has a single Fe atom in the center. c. It is a highly conjugated molecule. d. Oxygen binds to the nitrogen atoms of the heme group. e. Carboxylate groups serve to orient the heme group within the myoglobin. 2. Myoglobin and hemoglobin differ in that a. they have very different primary structures. b. they carry different heme groups. c. their heme groups contain different metal atoms. d. they fold into very different tertiary structures. e. None of these are true. 3. Microtubules are composed of _________________________ monomers. a. actin b. myosin c. tubulin d. kinesin e. None of these. 4. The primary structure of collagen contains which amino acid at approximately every third position? a. gly b. tyr c. arg d. asp e. his 5. Collagen a. is a very stretchy molecule. b. is made up of smaller right-handed helices. c. consists of a triple helix. d. crosslinks via cysteine residues. e. None of these are true. 6. Enzyme kinetics can tell researchers a. the rate of an enzymatic reaction. b. how reaction rates change with varying conditions. c. the affinity of a particular enzyme for different substrates. d. the pathway a certain enzyme uses to convert substrate into product. e. All of the above
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7. During the course of an enzyme-catalyzed reaction, the concentration of substrate decreases as the concentration of product increases. During the course of the reaction, concentration of the enzyme-substrate complex would a. increase b. decrease c. initially increase and then stay the same d. initially decrease and then stay the same e. steadily increase until it reached a peak and then steadily decrease. 8. According to Michaelis-Menton kinetics, what is one of the assumptions made about reaction rates? E + S ES E + P k 1 k -1 k 2 a. k 1 >> k -1 b. k 1 << k -1 c. k 2 >> k -1 d. k 2 >> k 1 and k -1 e. k 2 << k 1 and k -1 9. In a particular enzyme-substrate system, the addition of a competitive inhibitor a. decreases the V max . b. increases the V max . c. decreases the K M . d. increases the K M . e. decreases the k cat . 10. The domain of myosin that binds to the actin filament in muscle is the a. head b. neck c. tail d. tubule e. None of the above 11. Chymotrypsin catalyzes the hydrolysis of the peptide bond a. preceding large nonpolar residues. b. following large nonpolar residues. c. preceding positively charged residues. d. following positively charged residues. e. preceding negatively charged residues. f. following negatively charged residues.
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12. The most effective inhibitors to certain enzymatic reaction resemble the a. substrate b. product c. energy barrier d. transition state e. intermediate 13. All of the following amino acid side chains could participate in acid-base catalysis EXCEPT a. Asn b. Asp c. Tyr d. Lys e. Cys 14. A slight increase in the pH of hemoglobin’s environment would result in a. an increase in binding of 2,3-BPG to hemoglobin. b.
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Exam2-key-07 - CH 369 Exam 2 Multiple Choice - Spring 2007...

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