Question

Which is not true for nitrogenase enzyme in root nodules in legumes?

• A. Associated with Rhizobium
• B. Site of reduction of $N_2$ into $N{H}_3$
• C. It is a Mo-Fe protein
• D. Resistant to $O_2$ concentration

Answer 1

The correct option is D Resistant to $O_2$ concentration

Rhizobium is a nitrogen-fixing bacteria present in legume root nodules. The nodule contains all the necessary biochemical components-enzymes nitrogenase and leghaemoglobin. The enzyme nitrogenase is a Mo-Fe protein and catalyses the conversion of atmospheric nitrogen ($N_2$) to ammonia ($N{H}_3$). It is highly sensitive to the molecular oxygen (requires anaerobic condition). It has an oxygen-scavenger leg-haemoglobin in the nodules for its protection from oxygen.