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

Which enzyme is activated by the presence of more than one metal ion?

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

Digestive enzymes are included in which of the following classes?

The specific region of an enzyme where the substrate binds is known as the ...... .

An example of non-competitive inhibition is