The hormone that maintains the blood glucose level within the limit is

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

Which of the following statements is true regarding enzymes?

What is the primary function of enzymes in living systems?

How do enzymes help a substrate to be attacked by the reagent effectively?

Which enzyme is used for fermentation of glucose?