Identify the correct statement regarding biological nitrogen fixation.

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The first stable product of nitrogen fixation is hydrazine.

The enzyme nitrogenase is a Ni-Fe protein and catalyses the conversion of atmospheric nitrogen to ammonia.

16 ATP molecules are required for conversion of two molecules of nitrogen into four molecules of ammonia.

The enzyme nitrogenase is highly sensitive to the molecular oxygen hence it requires anaerobic conditions to function.

answer is D.

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Detailed Solution

The enzyme nitrogenase is highly sensitive to the molecular oxygen; it requires anaerobic conditions. The nodules have adaptations that ensure that the enzyme is protected from oxygen. To protect these enzymes, the nodule contains an oxygen scavenger called leg-haemoglobin.

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