369Exam1v1_S13(1) - Copy

What is the predominant secondary structure in

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33. What is the predominant secondary structure in amyloid or prion fibers? A) β sheet B) α helix C) random coil D) random turns E) none of the above 34. The weak acid HA has a dissociation constant K a of 1.5x10 -4 . The ratio [A-]/[HA] for a solution of this acid-base pair at pH 8.5 is 35. A coupled reaction always involves 36. Which of the following statements regarding the structure of keratin is TRUE? 37. When p O 2 = 15 torr, the fractional saturation of myoglobin ( p 50 = 2.8 torr) is A) 0.65 B) 0.58 C) 0.84 D) none are correct 38. Which of the following amino acids would be the best for buffering near neutral pH? Version 1 Page 4
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39. The power stroke in muscle contraction is associated with: 40. Which of the following statements regarding binding of O 2 to hemoglobin (Hb) is FALSE? 41. What is the net charge on the following molecule at pH 9.5? Table of pK values on exam cover. Ala-Cys-Lys-Arg-Glu-Gln-Gly-Val-Tyr-Pro A) -2 B) -1 C) 0 D) +1 E) +2 42. At pH 8.5, a solution of buffer with a p K of 7.5 would have more capacity to buffer the addition of ______. A) acid versus base B) base versus acid 43. Proteins are effective buffers because they contain 44. The p K of CH 3 CH 2 NH 3 + is 10.7. Would the p K of FCH 2 CH 2 NH 3 + be higher or lower? A) Higher B) Lower
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