What is ribozyme?

The enzyme that catalyzes the breakdown of a complex organic substance into simpler substances by adding a water molecule is:

Proteins that possess catalytic activity are called . . . . . . .

Identify the class of the enzyme Acetyl $CoA$ synthetase.

In the enzyme which catalyses the breakdown of:
$H_2O_2 \rightarrow H_2O + O_2$
the prosthetic group is:

What is the proteinaceous part of an enzyme called?