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JEE Main · 2026 · 24 Jan 2026 · Shift 2 · Biomolecules

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The number of possible tripeptides formed involving alanine (ala), glycine (gly) and valine (val), where no amino acid has been used more than once is :
  1. (A)6✓ Correct
  2. (B)3
  3. (C)4
  4. (D)8

Answer: (A)

Solution

A tripeptide using alanine, glycine and valine once each is a linear chain of the three different residues, and a peptide has a defined direction from the N-terminus to the C-terminus, so each ordering is a distinct tripeptide. The number of orderings of three different residues is . Six tripeptides are possible.

JEE Main · 2026 · 24 Jan 2026 · Shift 2 · Single correct option

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