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Question:

Which enzyme complex is responsible for the reduction of molecular nitrogen to the level of NH3 in root module of legume?

Nitrate reductase

Nitrite reductase

Aminase

Nitrogenase

Solution:

The correct option is Nitrogenase. Nitrogenases are a family of metalloenzymes that catalyse a key step in the global nitrogen cycle, the adenosine triphosphate (ATP)-dependent reduction of dinitrogen (N2) to ammonia (NH3).