YOUR NAME (prunt) Use scantron for Questions 1-27 Use the answer sheet (ast page

Question

YOUR NAME (prunt) Use scantron for Questions 1-27 Use the answer sheet (ast page of the exam) for Questions 28-33 Question 1 1. Enzymes are potent catalysts because they: A. lower the activation energy for 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. are consumed in the reactions they catalyze. 2 points Question 2 1. The role of an enzyme in an enzyme-catalyzed reaction is to: A. increase the rate at which substrate is converted into product. B. make the free-energy change for the reaction more favorable. back to substrate. C. bind a transition state intermediate, such that it cannot be converted D. ensure that all of the substrate is converted to product. E. ensure that the product is more stable than the substrate. 2 points Question 3 1. Which one of the following statements is true of enzyme catalysts? A. Their catalytic activity is independent of pH. given reaction by a thousand fold or B. They can increase the equilibrium constant for a C. They can increase the reaction rate for a given reaction by a thousand-fold or more. D. They are generally equally active onDand Lisomers of a given substrate. E. To be effective, they must be present at the same concentration as their substrate. 3 points Question 4 1. Which one of the following statements is true of enzyme catalysts? as their substrates. A. To be effective, they must be present at the same concentration B. They bind to substrates but are never covalently attached to substrate or product.

Explanation / Answer

Question -1

Enzymes are potent catalysts because they:

lower the activation energy for the reactions they catalyze.

Question-2

The role of an enzyme in an enzyme-catalyzed reaction is to:

increase the rate at which substrate is converted into product.

Question -3

Which one of the following statements is true of enzyme catalysts?

They can increase the reaction rate for a given reaction by a thousand fold or more.

Question-4

Which one of the following statements is true of enzyme catalysts?

They lower the activation energy for the conversion of substrate to product.

Question-5

Which of the following statements is false?

For S P, a catalyst shifts the reaction equilibrium to the right.

Question-6

Enzymes differ from other catalysts in that only enzymes:

display specificity toward a single reactant.

Question-7

The concept of “induced fit” refers to the fact that:

substrate binding may induce a conformational change in the enzyme, which then brings catalytic groups into proper orientation.

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