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Answer: 4. Ammonia and hydrogen

Key idea: Nitrogenase reduces nitrogen to ammonia and releases hydrogen.

The reaction is \(\mathrm{N_2 + 8e^- + 8H^+ + 16ATP \rightarrow 2NH_3 + H_2 + 16ADP + 16P_i}\). So the products are ammonia and hydrogen. Nitrate is not formed here, and oxygen is not a product (it actually inhibits the enzyme, which is why leghaemoglobin is present).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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