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(A) The enzyme responsible for biological nitrogen fixation is known as nitrogenase.This enzyme complex is found in the root nodules of leguminous pla

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Nitrogenase

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(A) The enzyme responsible for biological nitrogen fixation is known as nitrogenase.This enzyme complex is found in the root nodules of leguminous plants and catalyzes the conversion of atmospheric nitrogen $(N_2)$ into ammonia $(NH_3)$.The nitrogenase enzyme complex consists of two components: the $Fe$-protein (dinitrogenase reductase) and the $Mo-Fe$ protein (dinitrogenase).The $Fe$-protein contains an iron-sulphur cluster ($4Fe$ and $4S$) which participates in the redox reactions required for the reduction process.

The enzyme responsible for the reduction of molecular nitrogen to the level of ammonia in leguminous root nodule is

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