MICRB265 Lecture Notes - Electron Acceptor, Anaerobic Respiration, Light-Dependent Reactions
10 Apr 2014
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Document Summary
This chapter focuses on the metabolic diversity of anaerobic and aerobic metabolism with particular emphasis on chemolithotrophic and phototrophic microorganisms. Chemolithotrophs use inorganic compounds and phototrophs use light for energy sources rather than organic compounds. In addition, the significance of autotrophy the fixation of carbon dioxide into cell material and nitrogen fixation the reduction of atmospheric dinitrogen into ammonia is presented. Use reduced organic compounds as their carbon and electron source. Use carbon dioxide as their sole or principal carbon source. Chemotrophs obtain energy from chemicals (inorganic or organic) Mixotrophic organisms combine lithotrophic and organotrophic processes, relying on an inorganic energy sources (h2 is a common example) and an organic carbon sources because they may lack one or more enzymes for co2 fixation. Note that nearly all chemolithotrophs are also autotrophs mixotrophs are rare. The importance of prokaryotes in the geochemical cycling of nitrogen and sulfur is very obvious as many reactions are only catalyzed by them.
