Exam2Form1 - BMB 461 FS06 Exam II Form 1 1 N a m e S t u d...

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Unformatted text preview: BMB 461 FS06 Exam II Form 1 1 N a m e S t u d e n t N u m b e r BCH 461 - Midterm II October 20, 2006 This exam consists of 34 questions on 11 pages. Total points = 100. All questions except #34 are worth three points. Answers should be given on the bubble sheet. NOTE: At the back of the exam you will find tables containing information you need to answer the questions in this exam. BE SURE to mark the “form” field on your bubblesheet. ____________________________________________________________ 1. An important structural feature of cytochrome P450 as compared to myoglobin is a. The complete burial of the metal ion cofactor within the protein structure b. The use of a cysteinate rather than a histidine as a metal ligand c. The use of copper rather than iron as a metal ion cofactor d. The presence of six rather than five protein- or cofactor-derived metal ligands e. None of the above 2. A particular reaction involving the transfer of two electrons has a ∆ E of –0.25 V at 298 K. What is ∆ G? a. -12 kJ/mol b. -24.1 kJ/mol c. 24.1 kJ/mol d. -48.2 kJ/mol e. 48.2 kJ/mol 3. The addition of an activating phosphate group to an enzyme is most likely to be a. uncatalyzed b. catalyzed by a kinase enzyme c. catalyzed by a phosphatase enzyme d. catalyzed by a dehydrogenase enzyme e. catalyzed by the same enzyme that can dephosphorylate and thus deactivate it BMB 461 FS06 Exam II Form 1 2 4. D-glucose and D-galactose are a. enantiomers b. 2-epimers c. 3-epimers d. anomers e. none of the above 5. In the presence of which type of inhibitor will the apparent rate constant at low substrate concentration, k cat /K M , remain unchanged? a. competitive b. uncompetitive c. mixed with α ∫ α ’ d. mixed with α = α ’ e. allosteric 6. In your favorite enzyme, you observe that a mutation of a particular lysine residue to alanine drastically reduces V max for the enzyme but does not significantly alter K M . You conclude that this lysine residue is most likely important for a. substrate binding but not the chemical steps of catalysis b. the chemical steps of catalysis but not substrate binding c. both substrate binding and the chemical steps of catalysis d. the regulation of the enzyme e. none of the above, the residue is not important for enzyme function 7. Which of the following is not considered a high-energy phosphorus compound? a. glucose-1-phosphate b. phosphocreatine c. ATP d. phosphoenolpyruvate 8. Which of the following statements about nicotinamide (NADPH and NADH) redox cofactors is true? a. they are solubilized in membranes rather than aqueous solutions b. they are capable of both one- and two-electron transfers c. they are generally bound tightly or covalently to their corresponding enzyme d. they are only active in combination with heme proteins e. none of the above BMB 461 FS06 Exam II Form 1 3 9. β-D-glucopyranosyl-(1...
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Exam2Form1 - BMB 461 FS06 Exam II Form 1 1 N a m e S t u d...

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