BIOL 211 Chapter Notes - Chapter 29: Nitrogen Cycle, Electron Transport Chain, Light-Independent Reactions
27 Sep 2016
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Document Summary
Biological impact: the lineages in the domains bacteria and archaea are ancient, diverse, abundant, and ubiquitous. Abundance: in terms of the total volume of living material on our planet, bacteria and archaea are dominant life forms. Some microbes thrive in extreme environments: extremophiles have become a hot area of research. Medical importance: of the thousands of bacterial species living in and on your body, only a tiny fraction can disrupt normal body functions enough to cause illness, koch"s postulates. To establish a causative link between a specific microbe and a specific disease, koch proposed that four criteria had to be met: The microbe must be present in individuals suffering from the disease and absent from healthy individuals. The organism must be isolated and grown in a pure culture away from the host organism. If the organisms from the pure culture are injected into a healthy experimental animal, the disease should appear.
