What is ribozyme?

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

Decline in the activity of the enzyme hexokinase by glucose $6$-phosphate is caused by

The enzyme that catalyzes the removal of hydrogen from a substrate is:

Enzymes consist of a protein part and a prosthetic group connected by weak bonds. During activity,these weak bonds are separated. This process is known as:

What does an enzyme do?