Energy and Metabolism

Energy and Metabolism - E nergy and Metabolism I Energy a...

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Energy and Metabolism: I. Energy: a. All energy in some form or another comes from the sun b. Oxidation and Reduction—remember them! i. Gains e-, reduction ii. Loses e-, oxidation iii. Both always occur together (if something gains an electron, something else has to lose it) iv. Reduced molecule has more energy than oxidized molecule v. Usually a proton travels with the electron, thus a Hydrogen atom is usually what is moving c. Energy—the capacity to do work d. Thermodynamics: The science of energy exchange and transformation i. Measured in Kilocalories ii. Energy can be Kinetic or potential iii. Laws of Thermodynamics 1. Energy can be changed from one form or another, however it cannot be created or destroyed a. Forms of energy: i. Light energy—Kinetic ii. Heat energy—Kinetic or Potential iii. Chemical energy iv. Electrical, etc.
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2. In energy conversions, the potential energy of the final state is always less than the potential energy of the initial state a. Some energy is given off (exergonic reaction) i. Reaction may be spontaneous ii. (Endergonic reactions must be coupled with an exergonic reaction to occur) iv. Entropy—randomness in a system. In biological systems, energy must
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Energy and Metabolism - E nergy and Metabolism I Energy a...

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