Which Are True Describing the Secondary Structure of a Protein $\alpha$

question 54

Multiple Choice

Which are true describing the secondary structure of a protein that is an $\alpha$ -helix?
I. The helix is coiled counterclockwise.
II. The N-H bond and the C=O bond point outward.
III. Hydrogen bonding is between groups 4 amino acid units apart.
IV. The coil has 3.6 amino acids per turn.

• A) I, II
• B) I, III
• C) II, IV
• D) III, IV