All N₂-Fixing Systems are Nearly Identical and Have All of the Requirements

Question

All N2-fixing systems are nearly identical and have all of the requirements EXCEPT:
A) ATP.
B) O2-free conditions.
C) the enzyme nitrogenase.
D) strong reductant such as ferredoxin.
E) all are true.

Accepted Answer

All N₂-fixing systems require ATP, O₂-free conditions, the enzyme nitrogenase, and a strong reductant like ferredoxin. Therefore, none of the options are exceptions, making all statements true.