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Abhijeet Gaurav
Correct answer option is (C). Dinitrogenase reductase is a dimeric (α2) Fe-protein of about 70 kDa with a 4Fe–4S cluster, which binds ATP and transfers electrons to dinitrogenase. The enzymatic complex of nitrogenase. The molybdenum requiring nitrogenase (Mo-N2ase) is the long-studied enzyme complex found in all diazotrophs.