NEETChemistryBiomolecules
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): In the enzymes peroxidase and catalase, haem is classified as a prosthetic group. Reason (R): Prosthetic groups are organic compounds that are distinguished from other cofactors in that they are tightly bound to the apoenzyme. In the light of the above statements, choose the most appropriate answer
Options
- ABoth (A) and (R) are true but (R) is not the correct explanation of (A)
- B(A) is true but (R) is false
- C(A) is false but (R) is true
- DBoth (A) and (R) are true and (R) is the correct explanation of (A)
Correct answer
D. Both (A) and (R) are true and (R) is the correct explanation of (A)
Step-by-step solution
Assertion (A) is true: Haem is indeed the prosthetic group in peroxidase and catalase, which catalyze the breakdown of hydrogen peroxide. Reason (R) is true: According to NCERT, prosthetic groups are organic compounds distinguished from other cofactors (like co-enzymes) because they are tightly bound to the apoenzyme. Reason (R) correctly explains Assertion (A) because haem falls into the category of a prosthetic group precisely due to its tight binding to the apoenzyme in these specific enzymes. Answer: Both (A) a