Researchers require a medicine dose that reduces symptoms in at least 75% of patients, with side effects in no more than 5%.
The table shows trial results.
Table
| Dose | Number of patients | Patients with reduced symptoms | Patients with side effects |
|---|---|---|---|
| P | 80 | 56 | 2 |
| Q | 120 | 96 | 9 |
| R | 160 | 128 | 8 |
| S | 200 | 140 | 6 |
Which dose meets both requirements?
dose P
dose Q
dose S
dose R
87 exam-style questions on Edexcel GCSE Biology 5.3 Immune system and medicines, covering 5.3.1 The specific immune system, 5.3.2 Response to immunisation, 5.3.3 Advantages and disadvantages of immunisation, 5.3.4 Antibiotics and bacterial infections, 5.3.5 Aseptic techniques in culturing, 5.3.6 Cross-sectional areas of cultures, 5.3.7 Stages of developing new medicines, and 5.3.8 Production of monoclonal antibodies. Each one has a worked solution and a mark scheme showing where the marks go.