A laboratory adds the same number of particles of a human virus to each sample. The virus can infect the type of human body cell used.
| Sample | Contents |
|---|---|
| A | Living human body cells |
| B | Heat-killed human body cells |
| C | Nutrient solution with no cells |
Which statement describes the expected result after one day?
The number of virus particles increases in sample B because dead human cells can still support viral reproduction.
The number of virus particles increases in sample A, while the number of undamaged living cells remains unchanged.
The number of virus particles increases in sample A, while the number of undamaged living cells decreases.
The number of virus particles increases in sample C because nutrients alone allow viral reproduction.
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.