CSEC Biology · May/June 2016 · Paper 2 · Question 1(a)(iii)

Students investigate the effect of temperature on the rate of reaction of the enzyme, catalase. They use crushed potato as the source of the enzyme and place 5 mg into each of 7 test tubes. They add 3 cm³ of 1% hydrogen peroxide to each test tube and place them into water-baths kept at the following temperatures: 0 °C, 10 °C, 20 °C, 30 °C, 40 °C, 50 °C and 60 °C. They count the number of bubbles released per minute from each test tube and record the data in Table 1.

Explain the shape of the graph at EACH of the following temperature ranges: 0-10 °C, 11-40 °C, > 40 °C

This question uses a figure or table from the paper — you'll see it when you practise.