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Biology exam 2 2009

Biology exam 2 2009 - Biology 181R Sections 5 6H Brian...

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Biology 181R Sections 5, 6H Brian Larkins and Ramin Yadegari Hour Exam #2 October 9, 2009 (version 1 key) 1. Which of the following describes the first law of thermodynamics? a. The entropy of the universe is constantly increasing b. Energy cannot be transferred or transformed c. Energy cannot be created or destroyed d. A change in entropy is affected by the temperature e. At absolute zero, there is no change in entropy 2. Which of the following statements describes the laws of thermodynamics as they apply to living organisms? 3. What explains the evolution of multiple enzymatic steps in glycolysis and the Krebs cycle, rather than a single reaction that converts glucose into carbon dioxide and water? 4. Which of the following statements is (are) true about enzyme-catalyzed reactions? 5. Which of the following affects the rate of an enzyme catalyzed reaction? a. The concentration of the substrate b. The pH of the solution in which it occurs c. The concentration of the products d. Reversible inhibitors e. All of the above are true 6. Co-enzymes are organic molecules that bind at an enzyme’s active site and participate in the chemical reaction. Which of the following is an example of a co- enzyme?
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7. Consider the following reaction: sucrose ↔glucose + fructose The equilibrium constant (Keq) for the hydrolysis of sucrose in this equation is 140,000. This implies the reaction will _______________-.
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