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Outline 13 2008 Reactions & Enzymes

Outline 13 2008 Reactions & Enzymes - Lecture 13...

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Lecture 13: REACTIONS AND ENZYMES Summary. Biological metabolism allows matter to become transformed from what is generally available in the environment to what is needed to build and maintain the cell. All chemical reactions within the cell proceed according to the laws thermodynamics. Chemists summarize those laws by the change in free energy as reactants become products. If the change in free energy is negative, the reaction will occur spontaneously (downhill), although it may occur only infrequently. If the change in free energy is positive, the reaction will not occur spontaneously (up hill). The cell stores energy temporarily in the form of ATP, which is used to drive chemical reactions that are uphill. Proteins, acting as enzymes, act as catalysts of chemical reaction by lowering the energy barriers for intermediate chemical states in the reaction. The regulation of such enzymes controls the rate of metabolism according to the needs of the cell. Next we look at some
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