2Alecture+8

Life uses energy from fuel and light to turn simple

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Unformatted text preview: d form of reactants (less energy required to complete reaction) Inorganic Catalysts •  For example, Clay and pyrite (iron sulfide) provide a surface that can orient organic molecules, causing them to organize into chains (polymerize) Building blocks or “monomers” Life’s Catalysts: The structure, function, cost  and potential of proteins Chemical bond Clay su rface 2 1/24/10 Life is a catalyst that catalyzes its own synthesis? Life uses energy from fuel and light to: turn simple materials into cell mass Transition state A,B <-> C,D Energy of fuel, photons, chemicals of high G to pump nutrients in to move Products are catalysts! ΔG Released energy Energy of products Progress of a reaction to do work. This is work accomplished by a huge number of individual catalysts (about 5000 for a bacterium (E. coli) maybe 10,000 for you) These dictate all the metabolic capabilities we’ve talked about. Autotrophs, hetertrophs, fermenters, respirers, photosynthesizers, anaerobes, aerobes, differ in what catalysts they possess and therefore what reactions they can perform. The catalysts of modern life are mostly PROTEINS (ENZYMES) Other proteins are structural, pumps, “wires”, machines Structure is complicated  Synthesis is complicated The underlying principles are quite simple -- but profound Why does life use a catalyst for every reaction? Origins are hard to imagine When life originated, it must have used simpler catalysts. Look in modern life forms for clues to the past. Every r...
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