Which of the following is TRUE for a 3-pleated sheet? A. There are hydrogen bonds perpendicular to the direction of the polypeptide chain. B. The polvpeptide chain is almost fully extended. O C. The polypeptide chains may be hydrogen bonded together in parallel or anti-parallel orientation. O Aand C only are correct. O A, B, and C are correct.
Added by Theodore D.
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Step 1: Recognize that a beta-pleated sheet consists of beta strands with hydrogen bonds between strands. Show more…
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When comparing the α-helix to the β-sheet, which statement is correct only for the β-sheet? A. Extensive hydrogen bonds are formed between the carbonyl oxygen (C=O) and the amide hydrogen (N-H) of the peptide bond. B. It may be found in typical globular proteins. C. It is stabilized by interchain hydrogen bonds. D. Parallel β-sheets are connected by β-bends.
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Syon S.
Why are ̑α helices and β sheets common folding patterns in polypeptides? Both of these secondary structures require more than one polypeptide chain to be able to fold into these patterns. Since all proteins contain multiple polypeptide chains; these folding patterns are common. Since R-groups are present on all amino acids; there is a nearly infinite number of ways that α helices and β sheets can form As result; over evolutionary time, these folding patterns have become common Amino acid side chains are not involved in forming the hydrogen bonds, allowing many different sequences to adopt these folding patterns: Molecular chaperones tend to fold polypeptides into these common folding patterns.
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