Which one of the following is an enzyme?

Which enzymes catalyze the transfer of a group other than hydrogen between a pair of substrates?

The protein part of an enzyme is known as:

What is the component produced at the end of a biochemical reaction called?

Identify $P, Q,$ and $R$ in the following descriptions:
$P -$ The component that undergoes transformation in a chemical reaction.
$Q -$ The component formed as a result of transformation in a chemical reaction.
$R -$ The component that remains unchanged after the completion of a chemical reaction.
What are $P, Q,$ and $R$ respectively?

The protein portion of an enzyme is called: