試題詳解

62. For an α-has the sequence : ⁺H₃N-Asp-Trp-Gln-Leu-His-Val-Phe-Ala-Lys-Val-Glu-COO^-, the carbonyl oxygen (in the peptide bond) of the histidine residue is hydrogen bonded to the amide nitrogen of _______.
(A) Trp
(B) Lys
(C) Val
(D) Gln
(E) Leu