K101PracEx2-1

K101PracEx2-1 - Biology K101 Practice Exam 2 Reminder: ALSO...

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Biology K101 – Practice Exam 2 Reminder: ALSO do the Visual Practice Exam! Keep trying BOTH until you get the score you want …and don’t forget about the web quizzes and study guide! Chapter 8: An Introduction to Metabolism 1) Living organisms increase in complexity as they grow, resulting in a decrease in the entropy of an organism. How does this relate to the second law of thermodynamics? a) Living organisms do not obey the second law of thermodynamics, which states that entropy must increase with time. b) Life obeys the second law of thermodynamics because the decrease in entropy as the organism grows is balanced by an increase in the entropy of the universe. c) Living organisms do not follow the laws of thermodynamics. d) As a consequence of growing, organisms create more disorder in their environment than the decrease in entropy associated with their growth. e) Living organisms are able to transform energy into entropy. 2) Why is ATP an important molecule in metabolism? a) Its hydrolysis provides an input of free energy for exergonic reactions. b) It provides energy coupling between exergonic and endergonic reactions. c) Its terminal phosphate group contains a strong covalent bond that when hydrolyzed releases free energy. d) A and B only e) A, B and C 3) ATP generally energizes a cellular process by a) releasing heat upon hydrolysis. b) acting as a catalyst. c) coupling free energy released by ATP hydrolysis to free energy needed by other reactions. d) breaking a high-energy bond. e) binding directly to the substrate(s) of the enzyme. 4) Increasing the substrate concentration in an enzymatic reaction could overcome which of the following? a) denaturization of the enzyme b) allosteric inhibition c) competitive inhibition d) saturation of the enzyme activity e) insufficient cofactors 5) A molecule that is phosphorylated a) has an increased chemical reactivity; it is primed to do cellular work. b) has a decreased chemical reactivity; it is less likely to provide energy for cellular work. c) has been oxidized as a result of a redox reaction involving the gain of an inorganic phosphate. d) has been reduced as a result of a redox reaction involving the loss of an inorganic phosphate. e) has less energy than before its phosphorylation and therefore less energy for cellular work. 1
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6) Which of the following statements is true regarding enzyme cooperativity? a) A multi-enzyme complex contains all the enzymes of a metabolic pathway. b) A product of a pathway serves as a competitive inhibitor of an early enzyme in the pathway. c) A substrate molecule bound to an active site affects the active site of several subunits. d) Several substrate molecules can be catalyzed by the same enzyme. e)
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K101PracEx2-1 - Biology K101 Practice Exam 2 Reminder: ALSO...

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