The enzyme nitrogenase is a $....................$.

During biological nitrogen fixation,inactivation of nitrogenase by oxygen poisoning is prevented by

We find that $Rhizobium$ forms nodules on the roots of leguminous plants. Also,$Frankia$,another microbe,forms nitrogen-fixing nodules on the roots of the non-leguminous plant $Alnus$. Can we artificially induce the property of nitrogen fixation in a plant,whether leguminous or non-leguminous?

How many $ATP$ are required for the formation of one molecule of $NH_3$ by the nitrogenase enzyme?

Explain the process/mechanism of biological nitrogen fixation.

Which mineral element plays an important role in biological nitrogen fixation?