Question

A haem group is a prosthetic group made up of a protoporphyrin ring and a central iron (Fe) atom. Some of the enzymes have haem. Want to know more about it, attempt this question.Which of the following enzymes has/have heme as a prosthetic group?(i) Catalase (ii) Carboxypeptidase(iii) Succinic dehydrogenase (iv) Peroxidase

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

Answer 1

Answer: (D)

(D) (i) and (iv)

Answer 2

Explanation:
Co-enzymes tightly or covalently bonded to enzymes are called prosthetic groups, e.g., pyridoxal phosphate, heme, biotin. Heme is a prosthetic group containing ferrous ions. It is important for a number of biologically important hemoproteins such as myoglobin, cytochrome oxidase, catalase and peroxidase.Hence, the correct option is (D).