Multiple choice

In the beta pleated-sheet, the R-groups of the amino acids

  1. generate H-bonds to stabilize the sheet

  2. are found above and below the plane of the sheet

  3. form only anti-parallel sheets

  4. lie in the plane of the sheet
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In beta pleated sheets, the polypeptide backbone lies in the plane of the sheet, with the peptide groups forming hydrogen bonds between adjacent strands. The R-groups (side chains) alternate above and below this plane, minimizing steric hindrance between adjacent side chains.

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