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  • Enzymes
      • Living things have tons of chemical reactions going inside them all the time
      • They produce enzymes that speed up the chemical reactions
      • Enzymes are biological catalysts
      • All enzymes are proteins
        • Proteins are made up of chains of amino acids
          • These are chains are folded into a specific shape. This specific shape allows the enzyme to do its job
      • As well as catalysts, proteins act as:
        • Structural parts of tissues e.g. muscles
        • Hormones
        • Antibodies
      • Chemical reactions usually involve things either being split apart or joined together
      • Every enzyme has a specific shape that fits onto the substance involves in a reaction
      • Enzymes are really picky- they usually only catalyse one reaction
        • This is because, for the enzyme to work, the substance has to fit it's special shape. If the substance doesn't match the enzyme's shape, then the reaction won't be catalysed
    • a CATALYST is a substance which INCREASES the speed of a reaction, without being CHANGED or USED UP in the reaction


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