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Bio - Lecture 7 - -Therefore the reaction requires energy...

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Sheet1 Page 1 Chapter 6 - Metabolism Energy: The capacity to do work Generally exists in two main states -Potential: stored energy -Kinetic: motion energy -Thermal: heat energy Can exist in many forms Thermodynamics: (heat changes) is the study of energy 2 Laws of Thermodynamics: -1st:Energy cannot be created or destroyed ->Photosynthesis changes light into sugar ->Animals change food into motion -2nd: Disorder (entropy) is increasing ->It takes energy to keep things organized ->It is more likely something will become messy on its own than become clean Oxidation: lose an electron Reduction: gain an electron Redox Reaction: (reduction-oxidation) is when energy is transferred from one molecule to another -The reduced from of a molecule has more energy than the oxidized form Endergonic Reactions: The products of these reactions contain more energy than the reactants
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Unformatted text preview: -Therefore, the reaction requires energy to proceed->Endergonic = inward energy-They do not occur spontaneously Even Exergonic reactions need some energy to get started-This is called activation energy-Catalysts lower the activation energy Adenosine Triphosphate (ATP): The main form of energy in cells-Is used for short term energy supple and not for long term storage Is made of three parts:->Adenosine->Ribose->Triphosphate group The energy ATP contains lies in its bonds between the phosphate group Generally, only the last phsphate group is cleaved yielding ADP The cleaved phsphate grup is attached to another molecule and that molecule is "phosphorylated" Wehn the molecule is "dephosphorylated" the phosphate group is called inorganic phosphate Sheet1 Page 2 it can only change forms...
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