39. Which of the following statements regarding hydrogen bonding in secondary st

Question

39. Which of the following statements regarding hydrogen bonding in secondary structures is true? Both ahelices and -sheets only use intrachain hydrogen bonds. b. Both a-helices and -sheets only use interchain hydrog en bonds. use ntrachan hydrogen bonds and -sheets can use either intrachain or interchain d a-elic itrachain or interchain hydrogen bonds and -sheets only use interchain can use either e. None of the above O. 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 a and b only In the -pleated sheet conformation-(2 pt) a. there are bonds perpendicular to the direction of the polypeptide chain. c the polypeptide chains may be hydrogen bonded together in a paralel or antiparallel orientation. d. a and b only e. All of the above Which of the following is true about the alpha helix? (2 pt) a. the structure is stablized by hydrogen bonds o. there are 3.6 residues for every turn of the helix the pitch of the helix is 5.4 angsroms All of the above None of the above sulfide bonds in proteins occur between the side chains of which of the following amino acid residues? glutamine lysine cysteine All of the above

Explanation / Answer

39. C. Alpha-helices only use intrachain hydrogen bonds and beta-sheets can use either intrachain or interchain hydrogen bonds.

40. a and b only
Bulky R group in alpha helix make steric hindrance and leads to destablize alpha helix. Clusters of similar charge R group repel with each other and leads to destablize of alpha helix.

41. All of the above

42. All of the above

43. Cysteine

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