BLG 151 Lecture Notes - Lecture 11: Lithotroph, Phototroph, Heterotroph
5 Dec 2015
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Document Summary
Carbon source often provides h, o, and electrons. Use organic molecules as carbon sources which often also serve as energy source. Can use a variety of carbon sources. Use carbon dioxide their sole or principal carbon source. Chemotrophs obtain energy from oxidation of chemical compounds. Despite diversity of energy, electron, and carbon sources used by organisms, they all have the same basic needs. Reducing power to supply electrons for chemical reactions. Some have great metabolic flexibility based on environmental requirements. Provides distinct advantages if environmental conditions change frequently. Respiration involves use of an electron transport chain. As electrons pass through the electron transport chain to the final electron acceptor, a proton motive force (pmf) is generated and used to synthesize. Different from fermentation: respiration and fermentation doesn"t have it, somewhere in the path you"re going to use an etc. Final electron acceptor is different exogenous acceptor such as: no3.
