Heterotrophic Bacteri3

Heterotrophic Bacteri3 - 2 to ammonia (NH 4 ) to the...

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Heterotrophic Bacteria A vital symbiosis that bacteria seem to have participated in for hundreds of millions of years is their relationship with plants, both as soil nitrogen-fixing bacteria, as well as internal guests in the root nodules of plants of the pea family. Most organisms cannot use atmospheric nitrogen (N 2 ) directly. Some bacteria have the metabolic pathways to convert inorganic N 2 into various forms of organic nitrogen. Mutualistic nitrogen- fixing bacteria, such as Rhizobium, live in nodules on the roots of soybean, clover, and alfalfa plants (all members of the pea family, Fabaceae), where they reduce N
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Unformatted text preview: 2 to ammonia (NH 4 ) to the benefit of both themselves as well as their their host. These bacteria also benefit by using some of a plant's photosynthetically produced organic molecules. Plants need nitrogen for many important biological molecules including nucleotides and proteins. However, the nitrogen in the atmosphere is not in a form that plants can utilize. Many plants have a symbiotic relationship with bacteria growing in their roots: organic nitrogen as rent for space to live, as shown in Figure 16. These plants tend to have root nodules in which the nitrogen-fixing bacteria live....
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