Electron transferring enzymes belong to

Enzymes having different molecular arrangements but similar functions are known as:

$A$ : Non-competitive inhibitors have no effect on $V_{max}$.
$R$ : In non-competitive inhibition,inhibitor and substrate bind at same sites on the enzyme.

What is the complex formed by the binding of an enzyme and a substrate called?

Inorganic catalysts work efficiently at . . . . . . temperature and . . . . . . pressure.

Which enzymes catalyze the transfer of a group other than hydrogen between a pair of substrates?