A person swallows a small number of Salmonella bacteria in contaminated food. Two days later the person is seriously ill. Which statement explains this?
The bacteria increase in size inside the body and release more toxins
The bacteria take over the body cells, which then produce more toxins
The bacteria are broken down in the gut, which releases more toxins
The bacteria reproduce rapidly inside the body and release more toxins
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.