10.4: Enzymes and rates

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Enzymes and rate

  • Enzymes are specific because they have a precise tertiary structure which exactly matches the structure of the substrate.
  • Enzymes have a cleft on their surface that is tailored for the substrate to fit into, within the cleft are chemical groups which bind to the substrate and possibly react with it - this region of the enzyme is called the active site. 
  • E+S <-> ES -> EP -> E+P
  • The rate determining step is E+S -> ES
  • Enzymes are specific in their action. They are very sensitive to substrate, temperature, pH and inhibition. 
  • If the substrate concentration is high, the rate equation will be rate=k[E] 
  • This is because the rate of the reaction now depends only on the concentration of the enzyme as all the active sites have been filled with substrates. 
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