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B2 4.2c – Student worksheet
The shape of enzymes
The diagrams below show the enzyme that catalyses one of the reactions in respiration. Use the
diagrams to answer the following questions.
1
Copy the diagrams and label the enzyme in each one. (1 mark)
2
The active site is where the reactant sits in the enzyme.
3
a
Label the active site in the middle diagram. (1 mark)
b
Are the shapes of the reactant and active site similar or different? Explain your answer.
(2 marks)
a
Could this enzyme catalyse the breakdown of a different protein? (1 mark)
b
Explain your answer. (1 mark)
4
If the temperature increased, the special shape of the enzyme would change. Suggest how this
would affect how it catalyses the reaction. Explain your answer. (2 marks)
5
Write some sentences giving a correct description of an enzyme and using the following words
or phrases in any order. (6 marks)
unchanged, protein, catalysed, reused, increases the rate, reactant
6
List at least three processes in living organisms that are catalysed by enzymes. (3 marks)
7
Name two enzymes and the reactant molecule that each works with. (4 marks)
Sheet 1 of 1
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