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
- AX = Coenzyme, Y = Apoenzyme, Z = Holoenzyme
- BX = Prosthetic group, Y = Holoenzyme, Z = Apoenzyme
- CX = Prosthetic group, Y = Apoenzyme, Z = Holoenzyme
- 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