Multiple choice

Which of following amino acids have imino group instead of amino group?

  1. Proline

  2. Histidine

  3. Glycine

  4. Isoleucine
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A Correct answer
Explanation

Proline is unique among standard amino acids because its amino group is part of a pyrrolidine ring, making it a secondary amine (imino group) rather than a primary amine. This structural difference affects protein conformation and makes proline a helix-breaker. Other amino acids have primary amino groups.

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