What does $P$ represent in the given figure?

Which of the following enzymes becomes active in the presence of lipids?

Who suggested the proteinaceous nature of enzymes?

Which of the following properties is inconsistent with the properties of enzymes?

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

Which one of the following is not an example of hydrolases?