Lecture 3ReviewQuestionsKey

Lecture 3ReviewQuestionsKey - Review Questions Lecture 3 1....

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Review Questions Lecture 3 1. Coenzymes differ from enzymes in that coenzymes are a. only active outside the cell. b. polymers of amino acids. c. smaller molecules, such as vitamins. d. specific for one reaction. e. always carriers of high-energy phosphate. 2. Which statement about thermodynamics is true? a. Free energy is used up in an exergonic reaction. b. Free energy cannot be used to do work. c. The total amount of energy can change after a chemical transformation. d. Free energy can be kinetic but not potential energy. e. Entropy has a tendency to increase. 3. In a chemical reaction, a. the rate depends on the value of Δ G . b. the rate depends on the activation energy. c. the entropy change depends on the activation energy. d. the activation energy depends on the value of Δ G . e. the change in free energy depends on the activation energy. 4. Which statement about enzymes is not true? a. They usually consist of proteins. b. They change the rate of the catalyzed reaction. c. They change the Δ G of the reaction. d. They are sensitive to heat. e. They are sensitive to pH. 5. The active site of an enzyme a. never changes shape. b. forms no chemical bonds with substrates. c. determines, by its structure, the specificity of the enzyme. d. looks like a lump projecting from the surface of the enzyme. e. changes the Δ G of the reaction. 6. In an enzyme-catalyzed reaction, a. a substrate does not change. b. the rate decreases as substrate concentration increases. c. the enzyme can be permanently changed. d. strain may be added to a substrate. e. the rate is not affected by substrate concentration. 7. Which statement about enzyme inhibitors is not true? a. A competitive inhibitor binds the active site of the enzyme. b. An allosteric inhibitor binds a site on the active form of the enzyme. c. A noncompetitive inhibitor binds a site other than the active site. d. Noncompetitive inhibition cannot be completely overcome by the addition of more substrate. e. Competitive inhibition can be completely overcome by the addition of more substrate.
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8. Which statement about the feedback inhibition of enzymes is not true? a. It is usually exerted through allosteric effects.
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Lecture 3ReviewQuestionsKey - Review Questions Lecture 3 1....

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