The breakdown process is also called:

The synthesis of biological molecules is a $......$ process.

Which of the following statements best describes metabolism?

The process of forming large molecules from small molecules with the help of enzymes in the body is $P$.
The process of forming small molecules from large molecules with the help of enzymes in the body is $Q$.
What are the processes $P$ and $Q$?
$P \quad\quad\quad\quad\quad Q$

Define the following terms:
$(i)$ Entropy
$(ii)$ Metabolism

Assertion $A$: Many molecules participate in biochemical reactions.
Reason $R$: Biochemical reactions are metabolic reactions.
Which option is correct for Assertion $A$ and Reason $R$?