A scientist compares four veterinary practices in the same area. The practices treat similar numbers and types of bacterial infection.
| Veterinary practice | Antibiotic courses prescribed per 100 animals treated | Infections caused by an antibiotic-resistant strain (%) |
|---|---|---|
| A | 12 | 4 |
| B | 24 | 10 |
| C | 38 | 18 |
| D | 52 | 27 |
Explain the relationship between the number of antibiotic courses prescribed and the percentage of infections caused by the antibiotic-resistant strain.
A company suggests producing a new antibiotic whenever resistance to an existing antibiotic increases. Suggest why this is not a practical long-term solution.
71 exam-style questions on AQA GCSE Biology 6.3 The development of understanding of genetics and evolution, covering 6.3.1 Theory of evolution, 6.3.2 Speciation, 6.3.3 The understanding of genetics, 6.3.4 Evidence for evolution, 6.3.5 Fossils, 6.3.6 Extinction, and 6.3.7 Resistant bacteria. Each one has a worked solution and a mark scheme showing where the marks go.