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COMEDK20269 May 2026Evening ShiftChemistryBiomoleculesActual

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?

Options

  1. A6
  2. B8
  3. C5
  4. D7

Correct answer

D. 7

Step-by-step 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

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