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They are globular proteins that act as biological catalysts.

  • They allow biochemical reactions to happen at the temperature found in an organism.
  • They are unaffected by reactions and can be used many times.
  • They have a specific tertiary structure and react with a specific substrate to produce a specific product. 

Lowering the Activation Energy:

Activation Energy- The minimum amount of energy needed to start a reaction.

Enzymes lower the activation energy so that chemical reactions in cells occus with an acceptable temperature range and the overall rate of reaction is increased.

Lock and Key Hypothesis:

A substrate has a complimentary shape to the enzymes active site and forms an enzyme-substrate complex.

Effect of Temperature

    An increase in temperature results in more collisons between reactant molecules. The rate of reaction increases up to the optimum temperature.


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