MODULE 2 - MODULE 2 2a) The Physiological Diversity of...

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MODULE 2 2a) The Physiological Diversity of Microorganisms How do Microorganisms Make a Living? To grow, microbial cell must be able to take in energy and carbon compounds from environment Many diff ways they can make a living b/c many types of environments Preferred habitat is determined by organism’s physiology Two main energy sources for microorganisms o Chemicals: chemotrophs Organic chemicals (glucose, acetate): chemoorganotrophs Get their carbon from pre-existing organic compounds Ex. humans Inorganic chemicals (hydrogen gas, NH 4 + ): chemolithotrophs Only prokaryotes are chemolithotrophs (not prokaryotes) Oxidation of inorganic chemicals provides energy from carbon fixation o Light: phototrophs Most are photoautotrophic Get their carbon from CO 2 fixation Ex. plants The Domain Bacteria Proteobacteria o Ex. e coli o Cause most human diseases, we know most about these o Also called gram-negative bacteria Gram positive bacteria, also know a lot about this
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Cyanobacteria related to gram positive bacteria Thermotoga- grows at very high temperatures Env-OP2- never been cultured, only been isolated in certain environment The Domain Archaea Most exist in extreme environments, ex. very high salt concentration, temperature Env-marine organisms found to exist in marine environments (not extreme) Limit for growth at high temp is over 113C Organisms such as Pyrococcus grow at these extremely high temps Archaeal organisms are also found in swamps and in cow rumen (methanogens) The Domain Eukarya Diversity is dominated by microbial species
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MODULE 2 - MODULE 2 2a) The Physiological Diversity of...

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