Which nitrogen species is most readily incorporated into an organic molecule in the cell?

Question

Quizplus · Accepted Answer

Ammonia (NH3) is the most readily incorporated nitrogen species into an organic molecule in the cell because it is the direct, reduced form of nitrogen and can easily participate in cellular metabolic processes for biosynthesis. In contrast, nitrate (NO3-) and nitrite (NO2-) require reduction to ammonia before they can be incorporated into organic compounds, while dinitrogen (N2) requires energy-intensive nitrogen fixation by nitrogenase enzymes in certain bacteria and archaea. Nitric oxide (NO) is not typically incorporated into organic molecules but rather functions as a signaling molecule in cellular pathways.

Which Nitrogen Species Is Most Readily Incorporated into an Organic