Exam 3 (2006) - University of Houston BCHS 3304 Exam III...

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University of Houston BCHS 3304 Exam III Instructor Dr. Briggs Apr. 06, 2006 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 competitive inhibition? a. [S] ' K [S] V v M max 0 α + = b. [S] ' K [S] V v M max 0 + = c. [S] K [S] V v M max 0 + = d. [S] K [S] V v M max 0 + = e. [S] K [S] V v M max 0 + = 2). What is the Lineweaver-Burke expression under uncompetitive inhibition? a. max max M 0 V α ' [S] 1 V α K v 1 + = b. max max M 0 V α ' [S] 1 V K v 1 + = c. max max M 0 V 1 [S] 1 V α K v 1 + = d. max max M 0 V 1 [S] 1 V K v 1 + = e. [S] K [S] V v M max 0 + = 3). How many sugar molecules does an aldotetrose represent? a. One, book, pg. 197 b. Two c. Three d. Four e. Five 4). What kind of functional group does a ketose contain? a. Aldehyde b. Ketone c. Ketene d. Aldane e. Hexane
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5). How many carbon atoms does glucose contain? a. Three b. Four c. Five d. Six, book, pg. 197 e. Seven 6). The cyclic five-membered ring form of a sugar is called: a. Pyranose b. Fructose c. Glyceraldehyde d. Furanose , book, pg. 199 e. Ribose 7). Which closed-ring form of D-glucose listed below is most energetically stable? a. α -D-glucopyranose b. β -D-glucopyranose, book, pg. 200 c. α -D-glucofuranose d. β -D-glucofuranose e. α -D-galactose 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 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? a. Chair b. Bent chair c. Half chair, book pg 334 and notes d. Three legged chair e. Boat 9). What is the identity of the catalytic triad in serine proteases? a. Asp-Tyr-Ser b. Asp-His-Ser, book, pg. 311 c. His-Trp-Ser d. Lys-His-Ser e. Arg-Trp-Ser 10). What is the most suitable substrate for lysozyme? a. NAM-NAG, book, pg. 303 b. NAM-NAM c. MAN-MAN d. NMA-NMG e. NUM-NUM 11). What are the catalytic residues of lysozyme? a. Asp/Glu, book, pg. 303 b. Lys/Arg c. His/Lys d. Ser/Glu e. His/Ser 12). Catabolism is: a. The synthesis of complex molecules from simple ones b. Degradation of complex molecules into simple ones, book, pg. 354 c. The eating of human flesh d. The acquisition of free energy from sunlight e. Self-feeding organisms 13). What is the highest energy phosphate containing compound that we’ve discussed? a. Glucose-6-phosphate b. Phosphoenolpyruvate, book, pg. 362, table 13-2 c. ATP d. Fructose-6-phosphate e. 1,3-BPG 14). What gets put into the oxyanion hole in the active site of serine proteases?
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Exam 3 (2006) - University of Houston BCHS 3304 Exam III...

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