Two samples of artificial human skin each contained 100 living body cells. The same amount of a purified bacterial toxin was added to both samples. A protein made by white blood cells was also added to sample Y.
After 30 minutes, the damaged body cells were counted.
| Sample | Protein made by white blood cells added | Number of damaged body cells |
|---|---|---|
| X | No | 72 |
| Y | Yes | 11 |
Which protein was added to sample Y?
Explain your answer using the results in the table.
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.