Proline is not often found in a-helices of proteins because it
A) has a small, uncharged side chain.
B) has a very bulky side chain.
C) lacks a hydrogen atom on its amide nitrogen.
D) interacts with adjacent amino acids.

Question

Quizplus · Accepted Answer

Proline lacks a hydrogen atom on its amide nitrogen, which is necessary for forming the hydrogen bonds that stabilize the alpha-helix structure. This disrupts the helical conformation.

Proline Is Not Often Found in A-Helices of Proteins Because