Question

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): The nitrogenase enzyme is considered to be a sluggish and inefficient enzyme.
Reason (R): The nitrogenase enzyme must go through several catalytic reduction cycles, wherein the two components viz. Fe-Protein and MoFe-Protein get dissociated from each other following each electron transfer, before final product i.e. ammonia appears.
In light of the above statements, choose the correct answer from the options given below:

• A. Both (A) and (R) are true and (R) is the correct explanation of (A).
• B. Both (A) and (R) are true but (R) is NOT the correct explanation of (A).
• C. (A) is true but (R) is false.
• D. (A) is false but (R) is true.

Hint:

Remember that nitrogenase requires a minimum of 8 electron transfers, and each single-electron transfer requires a complete cycle of association, ATP hydrolysis, and dissociation of the Fe and MoFe proteins.
This makes the process slow but precise.

Answer 1

The Correct Option is A