Question

Which of the following statements is incorrect?
A. Enzymes exist in colloidal state
B. Enzymes are catalysts
C. Enzymes can catalyse any reaction
D. Urease is an enzyme

Answer 1

Hint: Enzyme is a type of protein that acts as a catalyst in many chemical and biochemical reactions. It helps in several biological functions. Every living organism has enzymes in their body.

Complete Step by Step Answer:
Enzymes act as a catalyst. A catalyst is a substance that increases the rate of a reaction without itself being used up. The concentration of the catalyst remains unchanged after a reaction. Thus enzyme also acts as a catalyst in biochemical reactions and increases the rate of the reaction without itself being used up.

Enzymes act as a catalyst. Thus enzyme only acts as a catalyst in biochemical reactions and increases the rate of the reaction without itself being used up. Enzymes are insoluble as they exist in colloidal states. Colloidal state is a state which has large identifiable particles in a solvent. Urease is an enzyme which catalyses the hydrolysis of urea and forms ammonia and carbon dioxide.
Thus the correct option is C.

Note: A catalyst is a substance that increases the rate of a reaction without itself being used up. A catalyst lowers the activation energy of a reaction and increases the rate of the reaction. Protein is present in hormones, enzymes etc. Enzymes also act as a catalyst.