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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 © Pearson Education Ltd 2011. Copying permitted for purchasing institution only. This material is not copyright free. 219