Bio 1a lect 7

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Unformatted text preview: Biology 1A Dr. Doudna 1 Pimentel 02/03/10 8am Lecture #7: Enzyme func1on •  Reading: Chapter 8, pp. 149‐155 •  Lecture outline: How enzymes work –  Free energy –  Enzyme‐catalyzed reacEons –  ATP powers much of the cell’s work Binding energy, ΔGB, is a major source of free energy used by enzymes to lower the acEvaEon energy of a reacEon. Not all are proteins, such as ribosomes (ribozymes) Enzymes speed up metabolic reac1ons by lowering energy barriers •  A catalyst is a chemical agent that speeds up a reacEon without being consumed by the reacEon •  An enzyme is a catalyEc protein •  Hydrolysis of sucrose by the enzyme sucrase is an example of an enzyme‐catalyzed reacEon Fig. 8-13 extremely specific for sucrose (binding site is only for sucrose) Sucrose (C12H22O11) Sucrase Glucose (C6H12O6) Fructose (C6H12O6) The Ac1va1on Energy Barrier •  Every chemical reacEon between molecules involves bond breaking and bond forming •  The iniEal energy...
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This note was uploaded on 02/27/2010 for the course BIO 1A taught by Professor Schlissel during the Spring '08 term at University of California, Berkeley.

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