More on Enzymes

HideShow resource information
  • Created by: alexda
  • Created on: 25-02-15 20:58
View mindmap
  • 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.


No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Enzymes and digestion resources »