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Unformatted text preview: Ch16b T4-Ch16c 18/02/2008 09:58:00 Topic #4 Benefits Mutualism (+,+) and Commensalism (+, 0) o Endosymbiosis mitochondria and chloroplasts are thought to be the descendants of free-living prokaryotes o Root nodules in some plants Bacteria provide N in exchange for water and nutrients o Digestive tracts of many animals Cows rely on stomach bacteria to digest cellulose o Many bacteria live in and on vertebrate bodies We get vitamin B12 and K from bacteria metabolism Flashlight fish Decomposition of dead organic material o Bioremediation (e.g. oil spills) o Sewage treatment Production of antibiotics Production of cheese and yogurt Topic #5 Harmful Effects Some (relatively few) prokaryotes are pathogenic o Pathogen an organism that causes disease o Kochs postulates 4 criteria to establish a causal relationship between a microbe and disease...
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