Catalase and peroxidase are enzymes that catalyse the breakdown of hydrogen peroxide into water and oxygen. Which of the following acts as a tightly bound prosthetic group for these enzymes?

Step-by-step solution

Catalase and peroxidase are enzymes that catalyse the breakdown of hydrogen peroxide into water and oxygen. These enzymes require a non-protein part for their catalytic activity. Haem is the prosthetic group present in both catalase and peroxidase. A prosthetic group is a tightly bound non-protein component of an enzyme. In this case, the haem group contains iron, which is essential for the enzymatic breakdown of hydrogen peroxide. Answer: Haem