A student investigates how pH affects the rate at which catalase breaks down hydrogen peroxide. The table shows the conditions used.
| pH | Temperature of reaction mixture (°C) |
|---|---|
| 5 | 22 |
| 7 | 30 |
| 9 | 38 |
Explain why this investigation would not show the effect of pH alone, and state one change the student should make to the investigation.
184 exam-style questions on OCR GCSE Biology 1.2 What happens in cells (and what do cells need)?, covering 1.2.1 Structure of DNA, 1.2.2 Nucleotides and complementary bases, 1.2.3 Protein synthesis, 1.2.4 DNA structure and the proteins made, 1.2.5 Investigating enzymatic reactions, and 1.2.6 Mechanism of enzyme action. Each one has a worked solution and a mark scheme showing where the marks go.