2004exam2Key - BCOR 011 Exam 2, 2004 Name:_ Section: _...

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BCOR 011 Exam 2, 2004 Name:_________________ Section: _______________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1. According to the first law of thermodynamics, A. the universe loses energy because of friction. B. matter can be neither created nor destroyed. C. energy is neither created nor destroyed. D. all processes increase the entropy of the universe. E. systems rich in energy are intrinsically unstable. 2. Whenever energy is transformed, there is always an increase in the A. entropy of the system. B. enthalpy of the universe. C. entropy of the universe. D. free energy of the universe. E. free energy of the system. 3. Which of the following is the most randomized form of energy? A. thermal (heat) energy B. light energy C. electrical energy D. mechanical energy E. chemical potential energy 4. Why is ATP an important molecule in metabolism? A. Its phosphate bonds are easily formed and broken. B. Hydrolysis of its phosphate groups is endergonic. C. It energizes other molecules by transferring phosphate groups. D. Two of the above . E. All of the above. 5. How can one increase the rate of a chemical reaction? A. Increase the entropy of reactants. B. Increase the activation energy needed. C. Add a catalyst. D. Decrease the concentration of reactants. E. Cool the reactants. 6. A solution of starch at room temperature does not decompose rapidly to a sugar solution because A. the activation energy barrier cannot be surmounted in most of the starch molecules. B. the hydrolysis of starch to sugar is endergonic. C. the starch solution has less free energy than the sugar solution. D. starch hydrolysis is nonspontaneous. E. starch cannot be hydrolyzed in the presence of so much water.
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7. All of the following are true of enzymes except A. Enzymes are essentially protein in their chemical composition. B. Enzyme function is dependent on the pH and temperature of the reaction environment. C. Enzyme function is dependent on the three-dimensional structure or conformation of the enzyme. D. Enzymes provide activation energy for the reaction they catalyze. E. Enzyme activity can be inhibited if their allosteric site is bound with a noncompetitive inhibitor. 8. How does an enzyme catalyze a reaction? A. by changing the equilibrium of a spontaneous reaction B. by lowering the energy of activation of a reaction C. by supplying the energy to speed up a reaction D. by lowering the G of a reaction E. by increasing the amount of free energy of a reaction 9. Consider the following: Succinic acid dehydrogenase catalyzes the reaction of succinic acid to fumaric acid. The reaction is inhibited by malonic acid, which resembles succinic acid but cannot be catalyzed by succinic dehydrogenase. Increasing the ratio of succinic acid to malonic acid reduces the inhibitory effect of malonic acid. Which of the following is correct? A. Malonic acid is the product, and fumaric acid is a competitive inhibitor.
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This note was uploaded on 02/28/2010 for the course BIO 50050 taught by Professor Batterton during the Fall '09 term at University of Texas at Austin.

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2004exam2Key - BCOR 011 Exam 2, 2004 Name:_ Section: _...

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