Unformatted text preview: such as amino acids or purines, while others obtain it from inorganic compounds such as nitrogen gas (N 2 ), ammonia (NH 3 ), or nitrate (NO 3-1 ). Before nitrate or nitrogen gas can be used, however, the nitrogen in the compounds must be changed into ammonia, a process called ammonification. The ammonia is then brought into the living system by an enzyme-catalyzed pathway in which glutamic acid and glutamine form. These amino acids are then used to synthesize other nitrogen compounds in the cell (Figure 1 )....
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- Fall '08
- Amino Acids, 15 percent, Ammonification.