Q38 / 180 · COMEDK 2026 (9 May Shift 2) · Chemistry

A small segment of a polypeptide gave on complete hydrolysis 3 molecules of alanine, 2 molecules of glycine and 3 molecules of cysteine. What is the number of peptide linkages in the segment of the polypeptide?

  • A
    $6$
  • B
    $8$
  • C
    $5$
  • Correct answer
    D
    $7$

Solution

Total number of amino acid molecules obtained on complete hydrolysis = $3 + 2 + 3 = 8$.

In a linear polypeptide chain, the number of peptide linkages is equal to the total number of amino acid residues minus one.

Number of peptide linkages = $8 - 1 = 7$.

Answer: $7$

Hence, the correct answer is option: 'D'.

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