Which of the following enzymes is found in saliva?

$A$ biological catalyst is essentially

What is the primary function of enzymes in living systems?

Which one of the following statements is not true about enzymes?

Statements about Enzyme Inhibitor Drugs are given below.
$A$. There are Competitive and Non-competitive inhibitor drugs.
$B$. These can bind at the active sites and allosteric sites.
$C$. Competitive Drugs are allosteric site blocking drugs.
$D$. Non-competitive Drugs are active site blocking drugs.
Choose the correct answer from the options given below.

Explain enzyme catalysis by giving an example.