A dog has a bacterial infection. A veterinarian takes a sample of the bacteria before prescribing an antibiotic. The sample contains bacteria that are either resistant or non-resistant to the antibiotic.
The veterinarian counts the two groups before treatment and after the antibiotic has been used for several days.
| Bacterial group | Number before treatment | Number after treatment |
|---|---|---|
| Non-resistant bacteria | 800 | 80 |
| Resistant bacteria | 20 | 60 |
State which group of bacteria increased in number during the treatment.
Suggest why the results changed in this way.
Explain why the resistant bacteria could be a concern if they were passed to a person.
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.