Enzymes - Lecture Enzymes Energy ability to do work...

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9/17/12 Lecture Enzymes Energy – ability to do work Potential energy (rock at top of hill) Chemical energy Electrical energy Kinetic energy (rock rolling down hill) Mechanical energy Heat energy Laws of thermodynamics First law of thermodynamics: energy is never created or destroyed Second law of thermodynamics: entropy Always some “loss” when energy is transferred. Tend to increase entropy ex: not all gas in a car is used to move it forward. Some is released as heat “Life” requires a constant input of energy → ex: food. W/o it, we move to a “random” state very quickly ATP – energy currency Adenosine triphosphate (high energy) Adenosine diphosphate (lower energy) Chemical reactions A + B ↔ AB ex: HCl + NaOH → H2O + NaCl Activation energy: energy boost required to initiate a chem rxn Catalysts reduce energy of activation speed up reactions neither created nor destroyed Enzyme (type of catalyst) catalysts for biological reactions
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