What is the proteinaceous part of an enzyme called?

$S$ - Statement: Ligases are enzymes that catalyze the linking of two compounds together.
$R$ - Reason: Isomerases are enzymes that catalyze the inter-conversion of optical,geometric,or positional isomers.

Who first used the term "enzyme"?

Which functional groups are present at the two ends of an enzyme's structure?

An example of non-competitive inhibition is

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