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JEE Main · 2025 · 02 Apr 2025 · Shift 2 · Biomolecules

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A tetrapeptide " " on complete hydrolysis produced glycine (Gly), alanine (Ala), valine (Val), leucine (Leu) in equimolar proportion each. The number of tetrapeptides (sequences) possible involving each of these amino acids is
  1. (A)16
  2. (B)32
  3. (C)8
  4. (D)24✓ Correct

Answer: (D)

Solution

Complete hydrolysis yields glycine, alanine, valine and leucine in equal amounts, so the tetrapeptide is built from four different residues, each occurring once. The number of distinct sequences equals the number of arrangements of four distinct units in four positions, . There are 24 possible tetrapeptides.

JEE Main · 2025 · 02 Apr 2025 · Shift 2 · Single correct option

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