04 - Biochemistry: The Molecular Basis of Life, 4/e...

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Unformatted text preview: Biochemistry: The Molecular Basis of Life, 4/e McKee/McKee Copyright 2009 by Oxford University Press, Inc. C H A P T E R 4 Energy Energy consumption is a requirement for life. Most energy in modern living organisms has ultimately been obtained from sun: Photosynthetic energy ! chemical energy ! heat Energy is the basic constituent of the universe that is intertwined with matter (condensed energy): E = mc 2 (Einstein), where E, total energy in a particle (J = kg m 2 /s 2 ) m, mass (kg) c, speed of light (3 x 10 8 m/s) Common perception of E = capacity to do work. E = w + q, where E, the change in energy of the system w, work; movement of an object by Force at a distance; (useful) q, heat absorbed by the system; (useless) Thermodynamics study of energy transformations accompanying physical and chemical changes in matter. Bioenergetics - branch of thermodynamics dealing with living systems. Enthalpy , H = total heat content. Entropy , S = disorder. Free energy ( G) = energy to do chemical work; a measure of spontaneity of reactions (involves H & S). Energy: Basics 4.1 Thermodynamics System Surroundings Closed system = exchange of energy but not matter Open system = exchange of energy AND matter. All living systems. Laws of thermodynamics 1. The total amount of energy in the universe is constant. Energy can neither be created nor destroyed, but it can be transformed from one form into another....
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This note was uploaded on 10/14/2010 for the course MOLB 3610 taught by Professor Gomelsky during the Fall '10 term at Wyoming.

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04 - Biochemistry: The Molecular Basis of Life, 4/e...

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