In the enzyme which catalyses the breakdown of: 2H2O2 2H2O + O2 the prosthetic group is :
- Niacin
- Nicotinamide adenine dinucleotide
- Haem
- Zinc
Answer
(3) Haem
Solution
The enzyme that catalyses the breakdown of hydrogen peroxide into water and oxygen is catalase (a peroxidase).
As per NCERT, prosthetic groups are organic compounds tightly bound to the apoenzyme; e.g., in 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.
⇒ NAD (containing niacin) is a co-enzyme and zinc is a metal-ion cofactor (of carboxypeptidase).
∴ The prosthetic group is haem.
Answer: (3)