Biological Nitrogen Fixation — Prelims Questions

Which of the following statements regarding the nitrogenase enzyme complex is INCORRECT?

Which of the following is an example of a free-living aerobic nitrogen-fixing bacterium?

What is the primary function of leghemoglobin in the root nodules of leguminous plants?

The overall reaction for biological nitrogen fixation catalyzed by nitrogenase is given by: $N_2 + 8e^- + 8H^+ + X ATP \rightarrow 2NH_3 + H_2 + X ADP + X P_i$. What is the value of 'X' in this equation?

Which of the following events occurs earliest during the formation of a root nodule in legume-Rhizobium symbiosis?

Which of the following is NOT a strategy employed by nitrogen-fixing organisms to protect the nitrogenase enzyme from oxygen?