Enzymes,vitamins,and hormones can be classified into a single category biologically because all of them $........$

What is the protein portion of an enzyme called?

The figure given shows the conversion of substrate into product by an enzyme. In which one of the four options,the components of the reaction labelled $a, b, c, \& \ d$ are identified correctly?
$(i)$ Potential energy
(ii) Transition state
(iii) Activation energy with enzyme
(iv) Activation energy without enzyme

What type of enzymes are used in the process of digestion?

All enzymes are proteins,except:

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