Cells make nitrogen into nitrate or ammonia, then make nitrate or ammonia into amino acids, then break down amino acids to ammonia and urea, and then break down ammonia and urea to nitrate and nitrite {nitrogen cycle, biochemistry}. Nitrogen-fixing bacteria {chemolithotroph} change nitrogen gas to ammonia. Nitrate-making bacteria make nitrate from ammonia.
Physical Sciences>Chemistry>Biochemistry>Chemical Cycle
5-Chemistry-Biochemistry-Chemical Cycle
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Date Modified: 2022.0224