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JEE Main levelSingle correct optionDifficulty 2 of 3bm096

In the tripeptide Gly-Ala-Ser (N-terminal to C-terminal), which residue uses both its amino group and its carboxyl group in forming peptide bonds?

  1. Aglycine
  2. Balanine
  3. Cserine
  4. Dall three residues

Answer: B

Gly uses only its carboxyl group (its amino group stays free), Ser uses only its amino group (its carboxyl stays free), whereas the middle residue Ala is bonded through both ends.
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