is true? s9. Which of the following statements regarding hydrogen bonding in sec
ID: 208165 • Letter: I
Question
is true? s9. Which of the following statements regarding hydrogen bonding in secondary structures and -sheets only use intrachain hydrogen bonds. a Both a-helices b. Both a-helices and -sheets only use interchain hydrogen bonds. c. a-helices only use hydrogern d. a-helices can use either intrachain strachan hydrogen bonds and -sheets can use either intrachain or interchain or interchain hydrogen bonds and -sheets only use interchain hydrogen bonds. hydrogen bonds. e. None of the above 40. Which of the following factors tend to destabilize a-helices? (2 pt) a. clusters of amino acids with bulky R-groups b. clusters of amino acids with similarly charged R-groups c. Hydrophilic interactions c. a and b only d. All of the above 41. In the -pleated sheet conformation- (2 pt) a. there are hydrogen bonds perpendicular to the direction of the polypeptide chain. b. the polypeptide chain is almost fully extended c. the polypeptide chains may be hydrogen bonded together in a parallel or antiparallel orientation. d. a and b only e. All of the above 42. Which of the following is true about the alpha helix? (2 pt) a. the structure is stablized by hydrogen bonds b. there are 3.6 residues for every turn of the helix c. the pitch of the helix is 5.4 angsroms d. All of the above e. None of the above 43. Disulfide bonds in proteins occur between the side chains of which of the following amino acid res a. glutamine b. lysine c. cysteine d. methionine e. All of the aboveExplanation / Answer
39)C. Alpha-helices only use intrachain hydrogen bonds and beta-sheets can use either intrachain or interchain hydrogen bonds.
40)c A and B only
41) E all of the above
42) D all of the above
43) c cysteine. two cysteine amino acids can together form a disulpide bridge to stabilize the structure fo the polypeptide
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