Enzymes B2

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Rates Of Reaction

  • Enzymes are biological catalysts. They increase the rate of chemical reactions inside and outside cells. 
  • Enzymes are specific in their action- each enzyme only catalyses a particular chemical reaction or type of chemical reaction.
  • During digestion, enzymes break down large insoluble food molecules into smaller, soluble ones that can dissolve into blood. 

How Enzymes Work

  • This diagram shows how an enzyme works. The substrate binds to a part of the enzyme called the active site
  • Notice how they fit together like a lock and key. An enzyme will only catalyse a particular reaction when the shape of its active site matches the shape of the substrate molecule. 
  • The enzyme catalyses the breakdown of the substrate into the products, which then leave the enzyme. The enzyme is then free to join


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