Biology - Enzymes

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  • Created by: tolulah
  • Created on: 06-12-15 10:16


An enzyme is a protein that acts as a biological catalyst - it speeds up biological reactions without being changed or used up. Enzymes are folded into complex shapes that allow smaller molecules (substrates) to fit into their active site


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Immobilised Enzymes

Immobilised enzymes are enzymes that are attached to an inertinsoluble material (eg. calcium alginate). Immobilised enzymes can be used to make lactose intolerant/cat milk through catalysing the breakdown of lactose to glucose and galactose.


  • can catalyse the same reaction many times
  • binding makes enzymes more stable and less likely to denature
  • purification is not necessary


  • requires extra time, equipment and work
  • may be reduction in reaction time
  • cannot be used if one of the substrates is insoluble
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