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PCB3134 - Lecture 5 Thermodynamics, Free Energy, and Reaction Equilibrium

PCB3134 - Lecture 5 Thermodynamics, Free Energy, and Reaction Equilibrium

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Click to edit Master subtitle style Chapter III Bioenergetics, Enzymes, and Metabolism
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Bioenergetics A living cell must acquireand expend energy to synthesizemacromolecules from raw materials, to produceand excretewasteproducts, to transmit genetic information from DNA to protein, to movevesicles, to transport ions across cell membranes. Thestudy of various types of energy transformations that occur in living organisms.
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Energy is thecapacity to do work. Potential Energy: Potential Energy exists whenever an object which has mass has a position within a forcefield. Themost everyday exampleof this is theposition of objects in theearth's gravitational field. PE = mgh PE = Energy (in Joules) m = mass (in kilograms) g = gravitational acceleration of theearth (9.8 m/sec2) h = height aboveearth's surface(in meters) Kinetic Energy: Kinetic Energy exists whenever an object which has mass is in motion with somevelocity. KE = (1/2)mv2 KE = Energy (in Joules) m = mass (in kilograms) v = velocity (in meters/sec)
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Conservation of Energy - TheFirst Law of Thermodynamics This principleasserts that in a closed system energy is conserved. Energy can neither becreated or destroyed. However, it can beconverted from one form to another form.
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system surroundings System: a certain space or a certain amount of matter under study Surroundings: the reminder of theuniverse
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