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Biomolecules in the Cell > Proteins - Peptide

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Estimated time: 2 minutes
Maharashtra State Board: Class 12

Key Points: Peptide Bond

  • Proteins are made up of α-amino acids linked together in a chain.
  • A peptide bond (–CO–NH–) is formed between the carboxyl group of one amino acid and the amino group of another with the removal of water (condensation).
  • Two amino acids form a dipeptide, three form a tripeptide, and many form polypeptides.
  • Proteins are long polypeptide chains containing more than 100 amino acid residues.
  • The ends of a protein chain are different:
    The N-terminal has a free amino group, and the C-terminal has a free carboxyl group.
  • A peptide bond is similar to a secondary amide linkage in organic chemistry.

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