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JEE Main2026Jan 24, Shift 2Chemistry
Q.

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

  2. B

    3

  3. C

    4

  4. D

    8

Solution

A tripeptide using each of the three amino acids exactly once corresponds to an arrangement (permutation) of the three residues in a linear chain. Peptide bonds are directional, so order matters.

Number of arrangements .

Explicitly: gly-ala-val, gly-val-ala, val-gly-ala, val-ala-gly, ala-val-gly, ala-gly-val.

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