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NEETBotanyBiomolecules (B)

Read the following statement and identify the correct terms for X, Y, and Z. "A non-protein organic compound (X) is tightly bound to the enzyme protein (Y) to form a complete catalytically active complex (Z)."

Options

  1. AX = Coenzyme, Y = Apoenzyme, Z = Holoenzyme
  2. BX = Prosthetic group, Y = Holoenzyme, Z = Apoenzyme
  3. CX = Prosthetic group, Y = Apoenzyme, Z = Holoenzyme
  4. DX = Metal ion, Y = Apoenzyme, Z = Holoenzyme

Correct answer

C. X = Prosthetic group, Y = Apoenzyme, Z = Holoenzyme

Step-by-step solution

According to NCERT, prosthetic groups are organic compounds that are distinguished from other cofactors in that they are tightly bound to the apoenzyme. Thus, X is a prosthetic group. The protein portion of the enzyme is called the apoenzyme, making Y the apoenzyme. The complete, catalytically active enzyme together with its bound cofactor is called the holoenzyme, making Z the holoenzyme. Coenzymes are also organic but their association with the apoenzyme is only transient. Metal ions are inorganic cofactors. Answ

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