Define enzymes.

Write short note on the following- Enzyme.

From which enzymes are made?

Match the following correctly 

The peptide

$\mathrm{Ala}-\mathrm{Lys} -\mathrm{Phe}-\mathrm{Gly}-\mathrm{Asp}-\mathrm{Trp}-\mathrm{Ser}-\mathrm{Arg}$

is allowed to undergo cleavage with the enzyme chymotrypsin(excess). The products obtained are

Assertion:- Carboxypeptidase is an exopeptidase.

Reason:- It cleaves the $\mathrm{N}$-terminal bond.

Assertion:- All enzymes are made up of proteins which have three dimensional structure.

Reason:- Secondary structure of protein are sequence of aminoacids.

What does A represent in the following graph showing enzymatic activity?