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Exam3_key_jmb_s07 - University of Houston BCHS 3304 Exam...

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University of Houston BCHS 3304 Exam III Instructor Dr. Briggs Apr. 05, 2007 Printed Name_____ANSWER KEY ________ LAST, FIRST Student ID#: Multiple choice, 2 pts each (100 pts) – Circle letter (i.e. a., b., c., d., or e.) of the most correct answer, then mark it on the Scantron sheet with a #2 pencil. Mark BOTH the exam AND the Scantron sheet. A table of half reactions and graph paper are at the end of this exam. 1). What is the Michaelis-Menton expression under uncompetitive inhibition? a. [S] ' K [S] V v M max 0 α + = b. [S] ' K [S] V v M max 0 α α + = c. [S] K [S] V v M max 0 + = α d. [S] K [S] V v M max 0 + = α e. [S] K [S] V v M max 0 + = 2). What is the Lineweaver-Burke expression under competitive inhibition? max max M 0 V α ' [S] 1 V α K v 1 + = max max M 0 V α ' [S] 1 V K v 1 + = max max M 0 V 1 [S] 1 V α K v 1 + = max max M 0 V 1 [S] 1 V K v 1 + = [S] V v M max 0 + = 3). How many sugar molecules does an ketotetrose represent? 4). What kind of functional group does an aldose contain?
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5). How many carbon atoms does fructose contain? a. Three b. Four c. Five d. Six e. Seven 6). The cyclic six-membered ring form of a sugar is called: 7). Which closed-ring form of D-glucose is most energetically stable? OH H CH 2 OH OH OH OH O OH H O H O O H OH HOCH 2 O CH 2 OH H H OH H OH OH H OH H OH OH CH 2 OH OH OH H O H OH O H O O H OH HOCH 2 O CH 2 OH H H OH H OH OH H H OH alpha-D-glucopyranose beta-D-glucopyranose a e a a a a a a a a a e e e e e e e e e
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8). In what conformation does lysozyme cause the D-ring sugar to adopt in its substrate in order to facilitate catalysis? 9). What is the identity of the catalytic triad in serine proteases? a. Asp-Tyr-Ser b. His-Trp-Ser c. Lys-His-Ser d. Arg-Trp-Ser e. Asp-His-Ser 10). What is the most suitable substrate for lysozyme? 11). What are the catalytic residues of lysozyme? 12). Catabolism is:
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