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Assume that a fictional microbe, Sacremonas shunensis, has an incredibly diverse nutritional profile that is able to combines aspect of phototrophy, lithotrophy, and heterotrophy depending on environmental conditions (it is not able to fix carbon). This fictional bacteria is found medical settings as an opportunistic lung pathogen, growing on the surface of nitrogen and nutrient poor wetland soils and also deeper in the wetland soil where the environment is still nitrogen poor as well as being anaerobic and relatively high in hydrogen and dissolved ferric (3+) iron. Assume that a human whose lungs are infected with Sacremonas shunensis resulting in the typical productive cough is working in a wetland environment. Describe a potential sequence of changes to the electron transport system(s) as the microbe finds itself expectorated from the nutrient rich aerobic environment of the lungs to the surface of the wetland and subsequently filters down into the anaerobic environment. In your answer you must include the sources and sinks for respiratory electrons in the different environments, modifications that would occur to the respiratory electron transport chains, and why the modifications to the electron transport system are energetically favorable in the different environments.

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Jarrod Robel
Jarrod RobelLv2
28 Sep 2019

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