The number of peptide bonds in a hexapeptide is
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 5
A peptide bond is the amide link (–CO–NH–) formed when the –COOH group of one amino acid reacts with the –\( \ce{NH2} \) group of the next, with the loss of a water molecule. Each amino acid added to the chain adds one more bond, so a chain of n amino acids has n − 1 peptide bonds.
A hexapeptide contains 6 amino acid units, so:
\( \displaystyle \text{Number of peptide bonds}=6-1=5 \)
NCERT (2026-27 edition):
Structure of Proteins – …
