Enzyme Metabolism

Enzyme Metabolism - ENZYME METABOLISM 2nd Law: When G <...

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ENZYME METABOLISM 2nd Law:   When ∆G < 0, Reaction is Spontaneous BUT for reaction to occur, a catalyst is needed A catalyst is a chemical agent that speeds      up a  reaction  without being consumed by the reaction     (remains unchanged by the reaction)     An Enzyme is a catalytic protein
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Biological reactions require enzyme catalyst H2O H H H H HO OH OH OH O O O O O H H H H H H H CH2OH CH2OH OH CH2OH HO HO OH OH CH2OH H CH2OH H CH2OH H O Sucrose Glucose Fructose C12H22O 11 C6H12O 6 C6H12O 6 + H OH H Hydrolysis of sucrose has ∆G ≈ -7kcal/mole or exergonic Sucrose is very stable unless the enzyme, sucrase is added Requirement for enzymes allows cell to control its metabolism sucrase
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All reactions have an activation barrier Every chemical reaction between molecules - Involves bond breaking Requires an initial investment of energy - Activation Energy (EA) Activation energy is a barrier to any reaction
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Enzyme LOWERS Activation Energy Enzyme does NOT change free energy of Rx Substrates and products remain the same Enzyme &rate of Rx
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Enzyme Metabolism - ENZYME METABOLISM 2nd Law: When G &lt;...

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