A protein segment forms a spiral shape held by hydrogen bonds between the carbonyl oxygen and amide hydrogen of every fourth amino acid.
Q1. A protein segment forms a spiral shape held by hydrogen bonds between the carbonyl oxygen and amide hydrogen of every fourth amino acid.
Answer: Alpha helix
Explanation: The alpha helix is a spiral held by H-bonds between amino acids, while beta-pleated sheets involve folding back of the polypeptide.