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BiologyYear 11
Biology
Enzyme activity and temperature
Biology · Year 11
QUESTION 312 marks
A student investigated how temperature affects the rate of a reaction catalysed by the enzyme catalase. The volume of oxygen produced in one minute was recorded at each temperature.
Results
| Temperature (°C) | 10 | 25 | 37 | 45 | 60 |
|---|---|---|---|---|---|
| Oxygen produced (cm³/min) | 4 | 11 | 19 | 12 | 1 |
1
Describe the relationship between temperature and the volume of oxygen produced.3 marks
interpreting data
2
Explain, in terms of enzyme structure, why the reaction rate falls above 45 °C.5 marks
denaturation
3
Identify two variables the student must control, and explain why each matters.4 marks
experimental design
a.
Name the two variables.
b.
Explain the effect of failing to control each one.
Enzyme activity and temperature