Two stem-cell treatments produce similar improvements in tissue function. The table shows the results after one year.
Table
| Treatment | Patients treated | Patients who developed a tumour |
|---|---|---|
| P | 200 | 8 |
| Q | 50 | 3 |
Which statement correctly compares the observed tumour risk?
P has a 4% risk; Q has a 6% risk.
P has an 8% risk; Q has a 3% risk.
P has a 6% risk; Q has a 4% risk.
P has a 3% risk; Q has an 8% risk.
42 exam-style questions on Edexcel GCSE Biology 2.1 Cell division and growth, covering 2.1.1 Mitosis and the cell cycle, 2.1.2 Division producing identical daughter cells, 2.1.3 Cancer and uncontrolled cell division, 2.1.4 Growth in animals and plants, 2.1.5 Importance of cell differentiation, and 2.1.6 Percentile charts to monitor growth. Each one has a worked solution and a mark scheme showing where the marks go.