To which class of compounds do enzymes belong?

During the process of digestion,the proteins present in food materials are hydrolysed to amino acids. The two enzymes involved in the process
$proteins$ $\xrightarrow{\text{enzyme } (A)} polypeptides$ $\xrightarrow{\text{enzyme } (B)} amino \ acids$,
are respectively

The correct match between Item $I$ and Item $II$ is

Item $I$	Item $II$
$A$. Allosteric effect	$P$. Molecule binding to the active site of enzyme
$B$. Competitive inhibitor	$Q$. Molecule crucial for communication in the body
$C$. Receptor	$R$. Molecule binding to a site other than the active site of enzyme
$D$. Poison	$S$. Molecule binding to the enzyme covalently

Which hormone tends to increase the blood glucose level in human?

Which of the following ions acts as a cofactor in enzymes?

Enzyme activity is maximum at $.......$ $K$.