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Unformatted text preview: How do cells control their metabolic reactions? Enzymes regulate chemical reactions Cells couple reactions Energy carriers How is metabolism controlled? Usually proteins A few enzymes are RNA (ribozymes) Enzymes are biological catalysts Catalysts speed up chemical reactions Activation Energy: controls reaction rate Speed up reactions Spefed up reactions that would occur anyway, but slower Not consumed in the reactions Enzymes are very specific Enzyme activity is regulated Five Properties of Biological Catalysts Substrates enter active site Shape change promotes reactions Product released; enzyme ready again Enzyme-Substrate Interactions Regulate synthesis Only active when needed Feedback inhibition Allosteric inhibition Competition inhibition Enzyme Regulation CHAPTER 6 - ENERGY FLOW IN CELLS CHAPTER 6 Page 1...
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This note was uploaded on 04/08/2008 for the course BIOL 1001 taught by Professor Minor during the Spring '08 term at LSU.
- Spring '08