9.28.05 - o Allosteric Regulation Photosynthesis/ Cellular...

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September 28, 2005 C6H12O6 + O2 6CO2 + 6H20, exergonic, ∆G is neg. Reactions and Free Energy A B d.G <0, spont EA=Activation Energy – Threshhold of energy that must be reached For this graph, ∆G is negative A catalyst lowers the activation energy. (dotted curved line) ABSOLUTELY NECESSARY!!! Enzymes made from Proteins. Food has X-PO4. The PO4 is cut apart via hydrolysis Dimer – Two active sites on the same molecule Cofactors Enzyme lowers Ea and cradle molecule Enzymes are EXTREMELY specific o Lock and Key analogy o Induced Fit after binds to substrate (like a handshake) The effects f substratres on Rxn sepeed. progress energy Ga ∆G
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Enzymes have specific optimal temperatures and pHs Other dfactos that affect enzyme activity o Cofactors o Inhibitors (competitive or noncompetitive)
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Unformatted text preview: o Allosteric Regulation Photosynthesis/ Cellular Respiration • Photosynthesis org. molecs and Oxygen cellular resp co2 and o2 and back again Electonegativity • Electronegativity- tendency of an atom to attract electrons. (determined by number of valence electrons & desire to fill shell) • ∆G is neg when an electronegative atom attracts another molecule (e.g. O attracting H to make OH) because you take the an H electron (high energy ) and bring it to carbon (low energy). • Inc electronegativity = dec energy • See image in book regarding methane and oxygen • Reduced – made more energetic • Oxidized – made less energetic. Substrate conc Red(with enzyme) Rate of prod. formation...
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This note was uploaded on 02/11/2008 for the course BIO G 101 taught by Professor Gilbert,c. during the Fall '07 term at Cornell University (Engineering School).

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9.28.05 - o Allosteric Regulation Photosynthesis/ Cellular...

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