Lecture 5 - 5. Energy & Enzymes. Iain McKinnell...

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Unformatted text preview: 5. Energy & Enzymes. Iain McKinnell Dept Biology Metabolism General Comments about metabolism Totality of the organisms chemical processes the management of the cells molecular & energy resources Results from the interaction of molecules organized into pathways What are the cells requirements for energy expenditure? Macromolecules Inter-conversion build up breakdown Extract Energy AB A + B Energy C + D CD Coupling of metabolic pathways 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 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 Thermodynamics Closed system exchanges energy but not matter with surroundings Open system exchanges energy and matter with surroundings 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 Second Law of Thermodynamics Total disorder of a system and its surroundings always increases Entropy is a measure of disorder Life and the Second Law of Thermodynamics Life is highly ordered...
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Lecture 5 - 5. Energy & Enzymes. Iain McKinnell...

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