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  • are biological catalysts, which increase the rate of a reaction.
  • to work the substrate molecule binds to the active site and the product is released.

lock and key:

  • active site is a lock and the substrate is the key.
  • specific active site.

induced fit:

  • enzyme is flexible so the active site can change.
  • the substrate starts to bind, active site changes shape.

factors that effect the rate of reactions.

  • temperature + reaction untill 40
  • PH + reaction until 7 - 8.
  • E-concentration + reaction 
  • S-concentration + reaction
  • inhibitors - rate of reaction : comp - fit / non-comp - dont fit.
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