More on Enzymes

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  • Created by: alexda
  • Created on: 25-02-15 20:58
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  • More on enzymes
    • Changing the temperature changes the rate of a reaction.
      • As the temperature increases, the rate of reaction increases. This is because more heat means the enzymes and the substrate particles have more energy to collide and react with each other.
        • If the temperature gets too hot, the bonds holding the structure together break. The shape of the active site changes and the substrate molecule no longer fits. As a result, the reaction will slow down and stop.
          • The enzyme becomes denatured and ceases to function. This is irreversible.
        • If the temperature is low, reactions are slow because the molecules have less energy so collisions are less frequent.
    • The higher the substrate concentration, the faster the reaction. This is because collisions are more likely between molecules.
      • When the concentration of substrate is high, all the active sites on the enzymes become occupied and the rate of reaction reaches a maximum and stays constant.
    • Enzymes work best at an optimum temperature (around 37) and pH level (usually pH 7).
      • Except for pepsin which is suited to the acidic conditions in the stomach so its optimum pH is 2.
    • If the pH level is too high or too low, it breaks the bonds holding the structure together, changes the shape of the active site and denatures the enzyme.

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