In protein secondary structure, which of the following amino acid residues cannot form an α-helix due to its presence?
Correct answer: A. Pro
Proline has a cyclic structure that disrupts the regular hydrogen bonding required for α-helical formation.
NCERT Biology Class 11, Chapter 9
Carbohydrates proteins lipids nucleic acids NEET Biology MCQ
Last updated: July 30, 2026
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