Which of the following enzymes serve as catalysts in metabolism? i. amylase ii. lactase iii. pepsin iv. polymerase

Amylase, Lactase and Pepsin all serve as catalysts in metabolism. A catalyst is a chemical that increases the rate of a chemical reaction without being changed by the reaction itself. Enzymes are catalytic proteins and they are only found in living organisms as part of their life processes. 

Aplant cell has vacuoles and a cell wall