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Lecture 5 - 5 Energy Enzymes Iain McKinnell Dept Biology...

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5. Energy & Enzymes. Iain McKinnell Dept Biology
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Metabolism General Comments about metabolism Totality of the organism’s chemical processes the management of the cell’s molecular & energy resources Results from the interaction of molecules organized into pathways
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What are the cell’s requirements for energy expenditure? Macromolecules Inter-conversion build up breakdown Extract Energy
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AB A + B Energy C + D CD Coupling of metabolic pathways
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Energy Transformations AB A + B Energy C + D CD a) takes ordered forms b) releases less ordered molecules and energy c) uses energy to build more organized molecules from precursors d) other work
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Energy Energy: The capacity to do work Kinetic energy: Energy of motion Potential energy: Stored energy Energy may be converted readily from one form to another The laws of thermodynamics describe energy flow in natural systems
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Thermodynamics Closed system exchanges energy but not matter with surroundings Open system exchanges energy and matter with surroundings
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First Law of Thermodynamics Energy can be transformed but not created or destroyed Total amount of energy in a system and its surroundings remains constant
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Second Law of Thermodynamics Total disorder of a system and its surroundings always increases Entropy is a measure of disorder
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Life and the Second Law of Thermodynamics
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