UT Knoxville BIOL 130 - Exam 3 Key (7 pages)

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Exam 3 Key



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Exam 3 Key

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Pages:
7
School:
University of Tennessee
Course:
Biol 130 - Biodiversity

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1 Biology 130 Fall 2012 Third exam KEY An exam is an opportunity where your preparation meets our challenge You acquire a soil sample and run an enrichment culture on it You provide the organisms in the culture with all of the ingredients required for growth except for nitrogen What result do you expect to have at the end of your experiment A Nitrogen fixing bacteria will significantly outnumber those incapable of fixing nitrogen B Nitrogen fixing bacteria will not be present in the culture C Nitrogen fixing bacteria will be present but not at significantly greater numbers than non nitrogen fixing species D Nitrogen fixing bacteria will be present but will be significantly outnumbered by non nitrogen fixing species This wasn t a very good question What I was thinking was that the sample is cultured on medium that lacks nitrogen but was growing under ambient questions i e where the atmosphere is 78 nitrogen I should have written the question like this You acquire a soil sample and run an enrichment culture on it You provide the organisms with a medium containing all of the ingredients required for growth except for nitrogen and grow it in an incubator under normal atmosphere What result do you expect to have at the end of your experiment Everyone got this one right regardless of the answer chosen An ecosystem based on chemolithotrophs exists 2 500 meters below the ocean surface near the Gal pagos Islands These archaea A use light as energy and carbon dioxide for carbon B use light as energy and get organic compounds from other organisms C oxidize inorganic substances for energy and use carbon dioxide for carbon D get both energy and carbon from organic compounds E oxidize organic compounds for energy and use carbon dioxide for carbon They could be utilizing something besides CO2 for carbon such as CO or CH4 but chemolithotrophs of any stripe obtain energy from the oxidation of inorganic molecules which is pretty cool Genetic exchange genetic recombination in bacteria



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