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 acquire and expend energy to synthesize macromolecules from raw materials, to produce and excrete waste products, to transmit genetic information from DNA to protein, to move vesicles, to transport ions across cell membranes. The study of various types of energy transformations that occur in living organisms.
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Energy is the capacity to do work. Potential Energy: Potential Energy exists whenever an object which has mass has a position within a force field. The most everyday example of this is the position of objects in the earth's gravitational field. PE = mgh PE = Energy (in Joules) m = mass (in kilograms) g = gravitational acceleration of the earth (9.8 m/sec2) h = height above earth's surface (in meters) Kinetic Energy: Kinetic Energy exists whenever an object which has mass is in motion with some velocity. KE = (1/2)mv2 KE = Energy (in Joules) m = mass (in kilograms) v = velocity (in meters/sec)
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Conservation of Energy - The First Law of Thermodynamics This principle asserts that in a closed system energy is conserved. Energy can neither be created or destroyed. However, it can be converted from one form to another form.
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surroundings System: a certain space or a certain amount of matter under study Surroundings: the reminder of the universe Internal energy (E): the energy of a system E = Q - W
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PCB3134 - Lecture 5 Thermodynamics, Free Energy, and Reaction Equilibrium

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