Micro303Lecture14 - Micro303Lecture14


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Unformatted text preview: Microbiology 303 Fall 2012 Lecture 14 Bioenerge8cs I Cell metabolism: the cell is a chemical factory Building a cell takes energy Energy is the capacity to cause change or do work Requirements for growth: Energy •  Energy is the ability to do work •  Cells need chemical energy to perform cellular func8ons, such as –  biochemical reac8ons –  movement –  transport •  Organisms that use energy stored in chemicals (chemical energy) are called chemotrophs •  Organisms that convert light energy to chemical energy are called phototrophs Chemical energy is the poten1al energy of electrons Chemical energy metabolism involves oxida8on ­ reduc8on (redox) reac8ons Ared Electron donor: loses electrons A gets oxidized Aox Box Bred Electron acceptor: gains electrons B gets reduced = electron Ared + Box Aox + Bred Methane = electron donor = “energy source” Energy is released as electrons move to place of lower poten8al energy Electron transfer between molecules is some8mes associated with release of poten8al energy of electrons, captured by the cell as ATP, an energy carrier Electron donor: High poten8al energy electrons Ared Box Aox Bred Electron acceptor: Electrons are in posi8on of lower poten8al energy Ared is the “Energy source” but mu...
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