nps59 - Enzyme Study Questions BIOC 462a STUDY QUESTIONS...

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Enzyme Study Questions BIOC 462a STUDY QUESTIONS BIOC 462a Enzyme Kinetics Fall Semester, 2007 1. How enzymes work Enzymes are potent catalysts because they: A) are consumed in the reactions they catalyze. B) are very specific and can prevent the conversion of products back to substrates. C) drive reactions to completion while other catalysts drive reactions to equilibrium. D) increase the equilibrium constants for the reactions they catalyze. E) lower the activation energy for the reactions they catalyze. 2. How enzymes work The role of an enzyme in an enzyme-catalyzed reaction is to: A) bind a transition state intermediate, such that it cannot be converted back to substrate. B) ensure that all of the substrate is converted to product. C) ensure that the product is more stable than the substrate. D) increase the rate at which substrate is converted into product. E) make the free-energy change for the reaction more favorable. 3. How enzymes work Which one of the following statements is true of enzyme catalysts? A) Their catalytic activity is independent of pH. B) They are generally equally active on D and L isomers of a given substrate. C) They can increase the equilibrium constant for a given reaction by a thousand fold or more. D) They can increase the reaction rate for a given reaction by a thousand fold or more. E) To be effective, they must be present at the same concentration as their substrate. 4. How enzymes work Which one of the following statements is true of enzyme catalysts? A) They bind to substrates, but are never covalently attached to substrate or product. B) They increase the equilibrium constant for a reaction, thus favoring product formation. C) They increase the stability of the product of a desired reaction by allowing ionizations, resonance, and isomerizations not normally available to substrates. D) They lower the activation energy for the conversion of substrate to product. E) To be effective they must be present at the same concentration as their substrates. 5. How enzymes work Which of the following statements is false ? A) A reaction may not occur at a detectable rate even though it has a favorable equilibrium. B) After a reaction, the enzyme involved becomes available to catalyze the reaction again. C) For S P, a catalyst shifts the reaction equilibrium to the right. D) Lowering the temperature of a reaction will lower the reaction rate. E) Substrate binds to an enzyme's active site.
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Enzyme Study Questions BIOC 462a 6. How enzymes work Enzymes differ from other catalysts in that only enzymes: A) are not consumed in the reaction. B) display specificity toward a single reactant. C) fail to influence the equilibrium point of the reaction. D)
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This note was uploaded on 07/01/2009 for the course CHEM 462a taught by Professor Dr.wei during the Spring '09 term at Cleveland State.

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nps59 - Enzyme Study Questions BIOC 462a STUDY QUESTIONS...

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