Q10.
Nitrogen fixation is basically a process of converting nitrogen gas into ammonia (NH3). One of the key enzymes in the process is “nitrogenase”. The production and activity of nitrogenase is very highly regulated as highlighted below:
a) Nitrogen fixation through nitrogenase is an energetically expensive process.
b) Nitrogenase encoding gene is under constitutive promoter.
c) Nitrogenase is highly sensitive to oxygen.
d) Endogenous availability of the cofactor of nitrogenase enzyme is very low.
Which one of the following combinations of above statements is correct?
A. a and b
B. a and c
C. b and c
D. b and d