GCSE Biology (AQA)

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Enzymes & Temperature

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Organisation Animal Tissues, Organs and Organ Systems

Enzymes & Temperature

2:41 Collision Theory and Rate of Reaction
Spec 4.2.2.1
Previous Collision Theory Next Enzymes & pH
  • The optimum temperature for an enzyme is where it functions most effectively.
  • Different enzymes have varying optimum temperatures.
  • A temperature scale in the diagram shows enzymes placed at their optimum temperatures, which differ for each enzyme.
  • In humans, enzymes generally work best around body temperature, approximately 37 degrees Celsius.
  • At 37 degrees Celsius, enzymes and substrates have the most successful collisions.
  • Moving away from the optimum temperature reduces enzyme activity.
  • A graph with temperature on the x-axis and enzyme activity on the y-axis shows that enzyme activity increases with temperature until it reaches the optimum at 37 degrees, then decreases as temperature continues to rise.
  • Enzymes are denatured by high temperatures, altering the shape of their active site and preventing them from binding to substrates.
  • Maintaining body temperature around 37 degrees Celsius is crucial for optimal enzyme function.

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