Unformatted text preview: form amino acids for protein synthesis. It is also required for synthesis of DNA, RNA, and ATP. Various ways organisms obtain nitrogen: 1. Break down proteins and recycle the amino acids into new proteins and other nitrogenous compounds. 2. Use nitrogen from ammonium ions (NH 4 +) 3. Use nitrogen from nitrates (compounds that dissociate to form nitrate ions NO 3 -4. Use gaseous nitrogen from the atmosphere. Bacteria able to do this are called nitrogen-fixing bacteria. These may live free in the soil, but often they are found within nodules on the roots of legumes—plants such as clover, soybeans, etc. This adds nitrogen to the soil—like free fertilizer from the air. Rhizobium and Bradyrhizobium are the most important genera....
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This note was uploaded on 01/23/2012 for the course MCB MCB2010 taught by Professor Smith during the Fall '09 term at Broward College.
- Fall '09