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2.12 Temperature and enzyme activity
Exam question
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A student found that amylase took 125 s to digest starch at 35 °C. Calculate the rate of reaction using rate = 1 ÷ time. Give your answer to 3 decimal places.
(2)Total for this question: 2 marks
2.12 Temperature and enzyme activity
Exam question
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At 25 °C, a protease took 320 s to clear a photographic film strip. Calculate the rate as 1 ÷ time to 4 decimal places.
(2)Total for this question: 2 marks
2.12 Temperature and enzyme activity
Exam question
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Describe how you could investigate the effect of temperature on the activity of amylase.
(4)Write your answer, then press Show model answer and tick each mark point your answer makes. Your answer is not saved.
Total for this question: 4 marks
2.12 Temperature and enzyme activity
Exam question
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Explain why the amylase and starch solutions are left in the water bath for a few minutes before being mixed.
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Total for this question: 2 marks
2.12 Temperature and enzyme activity
Exam question
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Explain why a buffer solution is added in an investigation into the effect of temperature on an enzyme.
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Total for this question: 2 marks
2.12 Temperature and enzyme activity
Exam question
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Suggest how a student could improve the reliability of results in an enzyme temperature investigation.
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Total for this question: 2 marks
2.12 Temperature and enzyme activity
Exam question
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Explain why iodine solution is used in the amylase investigation.
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Total for this question: 2 marks
2.12 Temperature and enzyme activity
Exam question
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Describe how to keep the temperature constant in an enzyme investigation.
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Total for this question: 2 marks
2.12 Temperature and enzyme activity
Exam question
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Identify the independent and the dependent variable in an investigation into the effect of temperature on how long lipase takes to digest milk fat.
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Total for this question: 2 marks
Plan it with CORMMSS: Design an investigation (Logic Lab).
2.12 Temperature and enzyme activity
Exam question
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Design an investigation to find out how temperature affects the rate at which the enzyme catalase breaks down hydrogen peroxide. Write your answer in full sentences.
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Total for this question: 6 marks
2.12 Temperature and enzyme activity
Exam question
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Explain why the same volume of iodine is placed in each well of the spotting tile.
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Total for this question: 2 marks
