Practice_Exam_2_with_answers

Practice_Exam_2_with_answers - 1) Of the following, the...

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1) Of the following, the structure of ATP is most closely related to A) an anabolic steroid. B) a double helix. C) RNA nucleotides. D) an amino acid with three phosphate groups attached. E) a phospholipid. 2) Whenever energy is transformed, there is always an increase in the A) free energy of the system. B) free energy of the universe. C) entropy of the system. D) entropy of the universe. E) enthalpy of the universe. 3) Which of the following is the most randomized form of energy? A) light energy B) electrical energy C) thermal (heat) energy D) mechanical energy E) chemical potential energy 4) Which of the following would decrease the entropy within a system? A) dehydration reactions B) hydrolysis C) respiration D) digestion E) catabolism 5) Which of the following reactions could be coupled to the reaction ATP + H 2 O ADP + Pi (-7.3 kcal/mol)? A) A + Pi AP (+10 kcal/mol) B) B + Pi BP (+8 kcal/mol) C) CP C + Pi (-4 kcal/mol) D) DP D + Pi (-10 kcal/mol) E) E + Pi EP (+5 kcal/mol) 6) During a laboratory experiment, you discover that an enzyme-catalyzed reaction has a Δ G of +20 kcal/mol. You double the amount of enzyme in the reaction, and the G now equals Δ A) -40 kcal/mol. B) -20 kcal/mol. C) 0 kcal/mol. D) +20 kcal/mol. E) +40 kcal/mol. 7) For the reaction FUMARATE -> SUCCINATE, the G is +172 kcal/mol. Which of the following is FALSE? A) Keq < 1 B) The reaction is not spontaneous C) The reaction is endergonic D) At equilibrium, the molar amount of fumarate will equal the molar amount of succinate E) At equilibrium, the rate of fumarate converted to succinate will equal the rate of succinate converted to fumarate 8) The Keq is 3.0 for the reaction glucose -> glucose-1P. If the initial concentration of glucose is 0.8 M, at equilibrium what is the concentration of glucose-1P? A) 0.2 M B) 0.3 M C) 0.4 M D) 0.6 M E) 0,8 M The next questions are based on the following information. A series of enzymes catalyze the reaction X Y Z A. → → → Product A binds to the enzyme that converts X to Y at a position remote from its active site. This binding decreases the activity of the enzyme. 9) Substance X is A) a coenzyme. B) an allosteric inhibitor. C) a substrate .
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D) an intermediate. E) the product. 10) Substance A functions as A) a coenzyme. B) an allosteric inhibitor. C) the substrate. D) an intermediate. E) a competitive inhibitor. The following questions are based on the reaction A + B C + D shown below 11) Which of the following represents the Δ G of the reaction? A) a
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Practice_Exam_2_with_answers - 1) Of the following, the...

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