Question

The enzymes required for nitrogen fixation is

• A. Nitrogen deaminase
• B. Nitrodioxidase
• C. Amino acid decarboxylase
• D. Nitrogenase

Answer 1

Answer: (D)

Nitrogenase

Reduction of inert atmospheric nitrogen to ammonia by living organisms is called biological nitrogen-fixation. Only certain prokaryotic organisms (some bacteria and cyanobacteria) are capable of fixing $N_2$. Such microbes are called $N_2$-fixers. These $N_2$-fixing microbes contain an exclusive enzyme, Nitrogenase that is capable of reducing nitrogen. This enzyme is required to fix atmospheric nitrogen ($N\equiv N$). It is made up of Mo-Fe protein. It catalyses the conversion of atmospheric nitrogen to ammonia.