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  1. RNA polymerase is one of the largest enzymes known with a molecular weight of 490000.
  2. It consists of six sub-units (i.e. polypeptide chains) - two identical α-subunits and one identical chain of each of β, β’, Ω and σ subunits.
  3. The complete RNA polymerase enzyme is termed as holoenzyme.
  4. Hence, RNA polymerase is a proteinaceous enzyme.