A traveller takes antimalarial drugs before, during and for four weeks after visiting a country where malaria is common. Why are the drugs taken after the traveller returns home?
The mosquitoes may have laid their eggs in the traveller's skin
The drug makes the traveller's blood unpleasant to mosquitoes
The drug needs several weeks to build up in the blood plasma
The protist may already be in the blood and cause illness later
176 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.