BIOL 2051 Chapter : Micro Chapter 4
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Document Summary
Microbial nutrition: all life requires, electron flow, to drive all life processes, drives ions into, out of cells, used to create atp, energy, to move electrons, materials, to make cell parts, nutrients -- chonps. Inorganic molecules are electron donors (iron: organotrophs, organic molecules are electron donors (glucose, ultimate electron acceptor. Inorganic molecules (nitrate or oxygen: respiration, organic molecules (pyruvate) Light energy excites electrons: excited molecules are electron donors, chemotrophs, chemicals are electron donors, oxidation of chemical, oxidation = donation of electrons, nutrients, macronutrients, major elements in cell macromolecules, c, h, o, n, p, s. Advantage: phototrophs - contain pigments that allow them to use light as an energy source. Less competition, unlimited source: heterotrophs - carbon source is organic carbon compounds, autotrophs - carbon source is carbon dioxide. These terms can be combined to more completely describe an organism. Example- photoautotroph obtains energy from light & carbon from carbon dioxide.
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