Which of the following acts as the prosthetic group in the enzymes peroxidase and catalase that catalyse the breakdown of hydrogen peroxide?

Step-by-step solution

In enzymes like peroxidase and catalase, which catalyse the breakdown of hydrogen peroxide to water and oxygen, haem is the prosthetic group and it is a part of the active site of the enzyme. Zinc is a metal ion cofactor for the proteolytic enzyme carboxypeptidase. Niacin is a vitamin that forms an essential chemical component of the coenzymes NAD and NADP. Flavin is associated with other coenzymes like FAD, not as the prosthetic group of catalase. Answer: Haem