Which of the following enzymes requires the presence of lipids for its activity?

On which substrate does the enzyme lipase work?

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

The substrate of the amylase enzyme is:

Which of the following is used to compare the catalytic efficiency of two different enzymes?

Enzymes as they exist inside the cell are