Enzymes which are slightly different in molecular structure but can perform identical activity are called

The following reaction depicts the activity of a particular class of enzymes:
$X-Y$ attached to $C-C$ (Substrate) $\xrightarrow{E}$ $X-Y$ + $C=C$ (Product)
Identify the enzyme class '$E$' from the following options:

Who proposed the principle of "Induced fit"?

Enzymes that catalyse the removal of groups of atoms from substrate molecules,other than by hydrolysis,leaving double bonds are -

Which one of the following is not an example of hydrolases?

Enzymes are primarily which type of proteins?