Read the following statement carefully: "A catalytically active enzyme with its non-protein constituent is called (X). When the non-protein constituent (Y) is removed, the remaining protein portion (Z) loses its catalytic activity." Identify (X), (Y), and (Z) correctly.

Step-by-step solution

The complete catalytically active enzyme together with its bound non-protein constituent is called the holoenzyme (X). The non-protein constituents that are bound to the enzyme to make it catalytically active are called cofactors (Y). The protein portion of the enzyme is called the apoenzyme (Z). As per NCERT, catalytic activity is lost when the cofactor is removed from the enzyme, which testifies that they play a crucial role in the catalytic activity of the enzyme. Answer: (X) - Holoenzyme, (Y) - Cofactor, (Z) -