If the following section of a polypeptide is folded into an a-helix,to which amino acid is the carbonyl group of alanine hydrogen bonded?
Ala-Ser-Val-Asp-Glu-Leu-Gly
A)aspartic acid
B)glutamic acid
C)leucine
D)valine

Question

Quizplus · Accepted Answer

The carbonyl group of alanine in an α-helix can form a hydrogen bond with the amide group of the amino acid located four residues ahead of it, which in this case is glutamic acid. Therefore, the correct choice is (B) glutamic acid.

If the Following Section of a Polypeptide Is Folded into an A-Helix,to