A laboratory compared samples of the same type of disease-causing bacterium collected ten years apart. Each sample was exposed to four antibiotics.
| Antibiotic | Older sample killed | Recent sample killed |
|---|---|---|
| P | Yes | Yes |
| Q | No | No |
| R | Yes | No |
| S | No | Yes |
What do the results show?
The bacterium has become resistant to antibiotic P.
The bacterium has become resistant to antibiotic R.
The bacterium has become resistant to antibiotic Q.
The bacterium has become resistant to antibiotic S.
252 exam-style questions on AQA GCSE Biology 3.1 Communicable diseases, covering 3.1.1 Communicable (infectious) diseases, 3.1.2 Viral diseases, 3.1.3 Bacterial diseases, 3.1.4 Fungal diseases, 3.1.5 Protist diseases, 3.1.6 Human defence systems, 3.1.7 Vaccination, 3.1.8 Antibiotics and painkillers, and 3.1.9 Discovery and development of drugs. Each one has a worked solution and a mark scheme showing where the marks go.