BIOLOGY 4: Enzymes 5.0 / 5 based on 2 ratings ? BiologyEnzymes and digestionGCSEOCR Created by: Chloe HanslowCreated on: 21-05-13 21:53 What are enzymes? Proteins that speed up chemical reactions 1 of 13 Which proteins speed up chemical reactions? Enzymes 2 of 13 What is a substrate? A molecule that is changed in a reaction 3 of 13 What does every enzyme molecule have? An active site 4 of 13 What is an active site? The part of an enzyme that the substrate joins on to 5 of 13 What does an enzyme have to be to fit into the active site? A specific shape 6 of 13 What is the model that demonstrates a substrate fitting into the active site of an enzyme? Lock and key model 7 of 13 What do enzymes need to work at their optimum? A specific constant temperature 8 of 13 Can you define 'optimum'? When an enzyme is most active 9 of 13 How does increasing the temperature first affect the rate of an enzyme? It increases 10 of 13 What happens if the temperature increases too much? The bonds holding the enzyme break and it becomes denatured 11 of 13 Why does an enzyme become denatured? When the shape of the active site changes to the substrate can no longer fit 12 of 13 What else, along with temperature can denature an enzyme? pH 13 of 13
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