BIOL 2051 Chapter Notes - Chapter 4: Radiant Energy, Cyanobacteria, Absorbance
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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 (carbon, hydrogen, oxygen, nitrogen, Electron flow requires: source of electrons phosphorous, sulfur) Organotrophs: organic molecules are electron donors (ex. glucose what we add to, ultimate electron acceptor culture media) Inorganic molecules (ex. nitrate or oxygen: said to grow by respiration, organic molecules (ex. pyruvate, said to grow by fermentation, source of energy, phototrophs (plants, cyanobacteria) These terms can be combined to more completely describe an organism. Example- photoautotroph obtains energy from light & carbon from carbon dioxide. Nutrient uptake: passive diffusion, some substances pass freely through membranes, o2, co2, follows gradient of material, facilitated diffusion, transporters pass material into/out of cell, follows gradient of material. Culturing bacteria: culture media - all materials necessary for growth, varies for different bacterial species, electron source, energy source.
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