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  • Enzymes
    • Enzymes speed up cellular reactions.
    • An enzyme is a biological catalyst produced by all living cells.
      • Catalysts are chemicals that speed up reactions, but are left unchanged after the reaction has been completed.
    • Enzymes are proteins
    • Enzymes act on substrates by attaching to them
      • Each different type of enzyme will usually act on only one substrate to catalyse one biological reaction.
    • Enzymes work at relativity low temperatures


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