BI-77
Effect of temperature and pH on enzymes
Biology · Secondary 3 · Hard · Effect of temperature and pH on enzymes
A student adds the same volume of hydrogen peroxide to equal masses of potato tissue in four test tubes. The pH in each tube is adjusted to 3, 5, 7 and 9. All tubes are kept at 30°C. The volume of oxygen produced in 2 minutes is measured. Why is temperature kept constant in this experiment?
- To prevent hydrogen peroxide from evaporating
- To ensure that only pH affects the rate of catalase activity
- To keep the concentration of catalase constant
- To stop the enzyme from being used up
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