Peptide bondMediumQuestion 870004
Question
The peptide bond (−CO−NH−) forms between:
- A−COOH of one amino acid and −NH₂ of another with loss of waterCorrect
- B−NH₂ of both
- C−COOH of both
- D−OH and −NH₂
Correct answer
−COOH of one amino acid and −NH₂ of another with loss of water
Explanation
Peptide bond formation (condensation): −COOH + H₂N− → −CO−NH− + H₂O. The peptide bond has partial double bond character (resonance) and is planar → proteins have defined secondary structures (α-helix, β-sheet).