369Exam1v1_S13(1) - Copy

During muscle contraction hydrolysis of atp results

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45. During muscle contraction, hydrolysis of ATP results in a change in the: A) conformation of actin D) structure of the thick filament B) conformation of myosin E) none of the above C) structure of myofibrils 46. A sodium acetate/acetic acid buffer is 0.1 molar in sodium acetate and 0.5 molar in acetic acid. What is the concentration of the buffer? 47. In a collagen chain, the most common repeating triplet comprises all of the following except Version 1 Page 5
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48. Which of the labeled groups in the figure below is an ester group? 49. Rank the solubility of the following amino acids in water at pH 6.5: H, F, S, I, D, W A) F > I > W > S > H > D D) H > S > D > I > F > W B) D > H > S > W > I > F E) D > S > H > F > I > W C) D > H > S > I > F > W 50. Assuming a temperature of 25 ° C and an entropy change of +75 J / K mol, the enthalpy change for a Δ G value of -11.0 kJ/mol is 51. A polypeptide has a high pI value. Which of the following amino acids are likely to be present? 52. Which of the following statements regarding denaturation and renaturation of DNA is TRUE? 53. Rank the mutant hemoglobins with the severity of their phenotype based on your knowledge of amino acids. Rank them in the order of those that are MOST nearly like wild type to those that are LEAST like wild type. a) Hb Bucuresti β 42Phe ---> Leu b) Hb Hammersmith β 42Phe ---> Ser c) Hb Sendagi β 42Phe ---> Val d) Hb Bruxelles β 42Phe ---> deleted A) a > c > b > d (least like wild type) D) b > c > a > d (least like wild type) B) d > b > c > a (least like wild type) E) b > c > d > a (least like wild type) C) c > a > b >d (least like wild type) 54. Which of the four primary alcohols in the table below would be the best solvent for ammonium ions? Version 1 Page 6
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