A student investigates the effect of pH on the rate of oxygen production during the decomposition of hydrogen peroxide catalyzed by the enzyme catalase.
The table shows their results:
| pH | Rate of oxygen production (cm3 s−1{\text{cm}^3\ \text{s}^{-1}}cm3 s−1) |
|---|---|
| 3.0 | 0.15 |
| 5.0 | 0.48 |
| 7.0 | 1.85 |
| 9.0 | 1.98 |
| 11.0 | 0.32 |
| 13.0 | 0.05 |
The student wants to increase their confidence in finding the exact optimum pH for this enzyme.
Which of the following actions should the student take?
Repeat the experiment at 0.5 pH0.5\ \text{pH}0.5 pH intervals across the entire range from pH 1.0 to pH 14.0.
Repeat the experiment using pH values of 7.2, 7.6, 8.0, 8.4, and 8.8.
Repeat the experiment at a higher temperature to increase the overall rate of reaction.
Repeat the experiment with a higher concentration of catalase enzyme at the same pH values.
44 exam-style questions on OCR GCSE Biology Practical skills. Each one has a worked solution and a mark scheme showing where the marks go.