Planarity of the Peptide Bond Means That No Rotation Occurs

Multiple Choice

Planarity of the peptide bond means that no rotation occurs about the _____ bond while rotation is allowed about the ____ and ____ bonds.

A) C(O) -N; Cα-Cβ; N-Cα
B) C(O) -N; Cα-C(O) ; N-Cα
C) Cα-C(O) ; C(O) -N; N-Cα
D) N-Cα; Cα-C(O) ; C(O) -N
E) none of the above