MIC 205A Chapter 11: Microbio Chapt. 11
6 Oct 2016
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Document Summary
Chapter 11: the diversity of bacteria and archaea. Scientists are only beginning to understand the vast diversity of microbial life. Although over 1,000,000 species of prokaryotes are thought to exist, only approximately. 6,000 of these, grouped into over 950 genera, have been described and classified. Some early chemotrophs used pathways of anaerobic respiration, using terminal electron acceptors such as carbon dioxide or elemental sulfur, which were plentiful in the environment. Chemolithotrophs obtain energy by oxidizing inorganic chemicals such as h2 to obtain energy. Methanogens are a group of archaea that generate atp by oxidizing hydrogen gas, using. They generate methane, a colorless, odorless flammable gas. Methanogens are found in anaerobic environments where hydrogen and carbon dioxide are both available. They are not normally found in enviornments containing high levels of sulfate, nitrate, or other inorganic electron acceptors to oxidize hydrogen have a competitive advantage. Chemoorganotrophs oxidize organic compounds such as glucose to obtain energy.
