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sampleexam1pt1 - BC 367 Exam 1 October 6 2005 Name Part I...

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BC 367 Exam 1- October 6, 2005 Name________________ Part I- Multiple Choice (33 points)- Choose the single most correct answer. 1. In glycolysis, fructose 1,6-bisphosphate is converted to two products with a standard free-energy change ( G' °) of 23.8 kJ/mol. Under what conditions encountered in a normal cell will the free-energy change ( G ) be negative, enabling the reaction to proceed spontaneously to the right? __ A. Under standard conditions, enough energy is released to drive the reaction to the right. __ B. The reaction will not go to the right spontaneously under any conditions because the G' ° is positive. __ C. The reaction will proceed spontaneously to the right if there is a high concentration of products relative to the concentration of fructose 1,6-bisphosphate. __ D. The reaction will proceed spontaneously to the right if there is a high concentration of fructose 1,6-bisphosphate relative to the concentration of products. __ E. Only if the reaction is coupled to an exergonic reaction can it proceed spontaneously. 2. Consider an acetic acid/acetate buffer, initially at the same pH as its p K a (4.76). When sodium hydroxide (NaOH) is mixed with this buffer, the: __ A. pH remains constant. __ B. pH rises more than when an equal amount of NaOH is added to unbuffered water at pH 4.76. __ C. ratio of acetic acid to sodium acetate in the buffer falls. __ D. pH rises more than when an equal amount of NaOH is added to an acetic acid/acetate buffer initially at pH 6.76. __ E. pH either rises or falls, depending on the amount of NaOH added. 3. Which of the following statements about buffers is true? __ A. The pH of a buffered solution remains constant no matter how much acid or base is added to the solution. __ B. The strongest buffers are those composed of strong acids and strong bases. __ C. A buffer composed of a weak acid of p K a = 5 is stronger at pH 4 than at pH 6. __ D. When pH = p K a , the weak acid and conjugate base concentrations are equal. __ E. The Henderson-Hasselbalch equation allows determination of the molecular mass of the weak acid component from its pH alone. 1
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4. Which of the following statements about protein secondary structure is false ? __ A. The φ and ψ angles for amino acid residues within α helices and β sheets fall within allowed regions of a Ramachandran plot.
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