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Biomolecules in the Cell > Proteins

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Estimated time: 3 minutes
Maharashtra State Board: Class 12

Key Points: Biomolecules in the Cell > Proteins

  • Proteins are polypeptides made of long chains of amino acids linked by peptide bonds.
  • In a polypeptide, the first amino acid is the N‑terminal amino acid and the last is the C‑terminal amino acid.
  • Protein structure is described at four levels: primary, secondary, tertiary and quaternary.
  • Primary structure is the linear sequence of amino acids.
  • Secondary structure involves local folding or coiling (α‑helix, β‑pleated sheet) stabilised by hydrogen bonds.
  • Tertiary structure is the three‑dimensional folding of a polypeptide due to side‑chain interactions.
  • Quaternary structure is the association of two or more polypeptide chains into a functional protein (e.g., haemoglobin).

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