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Unformatted text preview: In the cycle's next step, photosynthetic sulfur bacteria metabolize the hydrogen sulfide anaerobically. They oxidize the H 2 S, thereby releasing the sulfur as elemental sulfur (S). Elemental sulfur accumulates in the soil. Species of colorless sulfur bacteria, including members of the genera Thiobacillus, Beggiatoa , and Thiothrix , also metabolize the hydrogen sulfide, converting it to sulfate ions , which are then made available to plants for amino acid formation. The carbon cycle. Most of the organic matter present in soil originates in plant material from dead leaves, rotting trees, decaying roots, and other plant tissues. Animal tissues enter the soil after death. In the carbon cycle , soil bacteria and fungi recycle the carbon of proteins, fats, and carbohydrates by using the organic plant and animal matter in their metabolism. Without the carbohydrates by using the organic plant and animal matter in their metabolism....
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This note was uploaded on 11/14/2011 for the course BIO 1421 taught by Professor Farr during the Fall '08 term at Texas State.
- Fall '08