A culture of human cells is kept at different internal pH values. The rate of one enzyme-controlled reaction is measured. The results are shown in the table.
| Internal pH | Rate of reaction / mg of product per minute |
|---|---|
| 6.0 | 28 |
| 7.0 | 65 |
| 8.0 | 31 |
The cells normally maintain an internal pH close to 7.0. Their internal pH then changes from 7.0 to either 6.0 or 8.0.
Explain how the data show that a change in pH away from 7.0 could reduce the rate of cell reactions and predict one effect this may have on the cells.
76 exam-style questions on AQA GCSE Biology 5.1 Homeostasis, covering 5.1 Homeostasis. Each one has a worked solution and a mark scheme showing where the marks go.