Proteins that possess catalytic activity are called . . . . . . .

The figure given below shows the conversion of a substrate into product by an enzyme. In which one of the four options $(A-D)$ are the components of the reaction labeled as $A, B, C,$ and $D$ identified correctly?

The first enzyme to be isolated in crystalline form was .........

Match Column-$I$ and Column-$II$ with reference to enzymes and select the correct option.

Column-$I$	Column-$II$
$a$. Transferase	$i$. Aldolase
$b$. Hydrolase	$ii$. Alcohol dehydrogenase
$c$. Lyase	$iii$. Sucrase
$d$. Oxidoreductase	$iv$. Glucokinase

Electron transferring enzymes belong to

Which enzymes catalyze the interconversion of optical,geometric,or positional isomers?