The complete, catalytically active enzyme together with its bound...

Enzymes are composed of one or several polypeptide chains. However, there are a number of cases in which non-protein constituents called cofactors are bound to the enzyme to make the enzyme catalytically active.

The protein portion of such an enzyme is called the apoenzyme.

The complete, catalytically active enzyme together with its bound non-protein constituent (cofactor) is known as the holoenzyme.

Holoenzyme = Apoenzyme + Cofactor.

Answer: Holoenzyme