Exam III Fall 10

Exam III Fall 10 - N ame: CHEM3 40.01: B iochemistry I N...

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CHEM 340.01: Biochemistry I Exam 3-Catalysis and Enzymes, November 10, 20L0 Part I-Multiple Guess (50 pts.): For items l-25, select the single best answer. Please markyour answer on both the Scantron card and the exam. (2 points each.) Catalysis and Kinetics 1) En tncrease constants for the reactions they catatyze, c) drive reactions to completion. d) are unidirectional and can prevent the conversion of products back to substrates. 2) Which of the following statements is true of enzyme catalysts? a) Their catalytic activity is independent of pH. b) Thev are equally active on diffurent isomers ffite for a given reaction by a thousan or more. ffiffie Eiincentration as their substrate. c) lower the activation energy of the reaction catalyzed. d) are not consumed in the reaction. 3) 4) Which of the following is true of the a) lt cannot provide enou c) lt is the result of covalent bonds d) Most of it is used up simply binding the substrate to the enzyme. 5) For an enzyme that follows Michaelis-Menten kinetics, which of the following statements about a plot of vo vs. [S] is false? a) As IS] increases, the initial velocity of the reaction also increases. is the [S] at which vo is 7z V,",. d) The shape of the curve is a E+s =3* g.5*Jt*g*p 6) Consider the following enzyme mechanism. k"t For this mechanism, K" can be considercd ap.'r.'-.imarely equal to Ko only if the probability of: a) the enzyme and substrate forming a productive complexgreater than the probability of the 1\ complex falling apart. ( Ol )the enzyme binding substrate is r,nuch greater than the probability of the enzyme-substrate \-/ complex falling apart. c) the enzyme and substrate formiqg a complex.is greater than the probability of the complex , producing a product. d) the enzyme and substrate forming a productive complex is much smaller than probability of the complex falling apart to give
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This note was uploaded on 12/04/2011 for the course CHEM 340 taught by Professor T.baird during the Fall '11 term at S.F. State.

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Exam III Fall 10 - N ame: CHEM3 40.01: B iochemistry I N...

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