Exhibit 4B Refer to Exhibit 4B.Which one shows hydrogen bonding of the peptide backbone?
A) M
B) N
C) P
D) M and N
E) All of these

Question

Exhibit 4B  Refer to Exhibit 4B.Which one shows hydrogen bonding of the peptide backbone?
A) M 
B) N 
C) P 
D) M and N 
E) All of these

Quizplus · Accepted Answer

Both M and N show hydrogen bonding of the peptide backbone. In M, the amide hydrogen (–NH) is hydrogen bonded to the carbonyl oxygen (–C=O) of the adjacent peptide bond. In N, the carbonyl oxygen (–C=O) of one amino acid is hydrogen bonded to the amide hydrogen (–NH) of another amino acid. P does not show any hydrogen bonding of the peptide backbone.