The correct statement about peptides and proteins is:

  • A
    Tertiary structure of proteins has two or more polypeptide subunits.
  • B
    Only the proteins having a quaternary structure are biologically active.
  • C
    In $\beta$-pleated sheet structures, peptide chains are held together by intermolecular hydrogen bonds.
  • D
    In $\alpha$-helices, the polypeptide chain is twisted into a left-handed screw (helix) through intramolecular hydrogen bonds.

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