Question

Which of the following enzymes has/have heme as a prosthetic group?
(i) Catalase
(ii) Carboxypeptidase
(iii) Succinic dehydrogenase
(iv) Peroxidase

• A. (i) only
• B. (i) and (ii) only
• C. (ii) and (iii) only
• D. (iii) and (iv) only
• E. (i) and (iv) only

Answer 1

Answer: (E)

Prosthetic groups are nonprotein organic cofactors firmly attached to apoenzymes, e.g., heme (= haem), biotin, pyridoxal phosphate. Heme (= haem) is iron containing prosthetic group in cytochromes, haemoglobin, myoglobin, catalase and peroxidase.