Question

Elements associated with nitrogenase enzyme in biological nitrogen fixation
(A) Molybdenum
(B) Iron
(C) Copper
(D) Nickel
Choose the correct answer from the options given below:

• A. (A), (B) and (D) only
• B. (A) and (B) only
• C. (A), (B), (C) and (D)
• D. (B), (C) and (D) only

Hint:

Mo, Fe, and Ni are essential for nitrogenase enzyme activity in nitrogen fixation.

Answer 1

The Correct Option is A

Step 1: The nitrogenase MoFe protein uses molybdenum and iron at its active site.
Step 2: The Fe protein component supplies electrons using iron.
Step 3: An associated Ni-Fe hydrogenase in many nitrogen fixers links nickel to the process, while copper plays no role.
Step 4: Correct answer is (A), (B) and (D) only, molybdenum, iron and nickel.