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Question

(B) Biological nitrogen fixation is catalyzed by the enzyme nitrogenase. The overall equation for the reduction of $N_2$ to $NH_3$ is: $N_2 + 8e^- + 8

Vedclass · Accepted Answer

$8$ molecules of $ATP$ are consumed.

Vedclass · Answer

(B) Biological nitrogen fixation is catalyzed by the enzyme nitrogenase. The overall equation for the reduction of $N_2$ to $NH_3$ is: $N_2 + 8e^- + 8H^+ + 16ATP \rightarrow 2NH_3 + H_2 + 16ADP + 16Pi$. According to this equation,the reduction of $1$ molecule of $N_2$ requires $16$ molecules of $ATP$ to produce $2$ molecules of $NH_3$. Therefore,for the fixation of $1$ molecule of $NH_3$,$8$ molecules of $ATP$ are consumed.

Select the correct option for the fixation of $1$ molecule of ammonia.

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