Ex2_2006 - BioG 101 Cornell University Oct. 31, 2006 EXAM 2...

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BioG 101 Oct. 31, 2006 Cornell University C. D. Hopkins 1 EXAM 2 (2006) MULTIPLE CHOICE. Choose the one best answer from among those given. Mark the answer on the op-scan sheet provided. Keep a record of each of your answers on these pages so that you can correct your test using the answer key provided on the course website. Exam tip : There is no penalty for guessing. Your score is determined by the number of correct answers. 1. (1 pt) The first law of thermodynamics states that energy can be transformed, but is neither created nor destroyed. For living organisms, which of the following is a necessary consequence of the first law of thermodynamics? A) The organism ultimately must obtain all the necessary energy for life from the environment. B) The entropy of an organism decreases over time as the organism grows in complexity. C) The energy content of an organism remains constant. D) Organisms are unable to transform energy. E) Life does not obey the laws of thermodynamics. 2. (1 pt) A lizard maintains its body temperature during the day by A) exercise and diet. B) shivering or sweating. C) absorbing radiant energy from the sun, seeking shade, and evaporative heat loss. D) increasing or decreasing its basal metabolic rate. E) increasing or decreasing food intake. 3. (1 pt) Which of the following is most similar in both structure and function to that of NADH? A) Ribulose bi-phosphate B) FADH2 C) cyclic AMP D) RNA nucleotide E) Inositol triphosphate, IP 3 4. (1 pt) The most common means by which enzymes accelerate the rate of a chemical reaction is by: A) lowering the activation energy of the transitional states between reactants and products. B) making the Δ G of the reaction more negative. C) changing the Δ G of the reaction from positive to negative. D) changing the equilibrium concentrations of reactants and products. E) coupling ATP hydrolysis to the chemical reaction.
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BioG 101 Oct. 31, 2006 Cornell University C. D. Hopkins 2 Nicotinamide adenine dinucleotide 5. (1 pt) When a chemical reaction is at equilibrium: A) no enzymes are functioning. B) the reactants and products have equal concentrations. C) the rate of forward and reverse reactions are equal. D) the reaction has a negative Δ G. E) the reactants and products have equal entropy. 6. (1 pt) In bacteria, the regulated synthesis of the amino acid isoleucine from threonine is by a series of five reactions catalyzed with enzymes E1 through E5. What is the most likely effect of isoleucine on enzyme E1? A) no effect B) feedback activation C) allosteric activation D) competitive inhibition E) allosteric inhibition 7. (2 pts) Fresh-picked corn is sweet because of the high content of sugar in the kernels while store-bought corn becomes less sweet because over 50% of the sugar is converted to starch within a day of picking. By blanching fresh corn for a few minutes in boiling water, its sweetness may be preserved for long term freezing. Why does this procedure preserve taste? A)
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This note was uploaded on 03/03/2008 for the course BIO G 101 taught by Professor Gilbert,c. during the Fall '07 term at Cornell University (Engineering School).

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Ex2_2006 - BioG 101 Cornell University Oct. 31, 2006 EXAM 2...

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