A scientist has two samples of cells. One sample is from potato tissue and the other is from the lining of a fish's mouth. The sample labels have been mixed up.
The scientist carries out three tests. The stain used attaches only to cellulose.
| Test | Sample X | Sample Y |
|---|---|---|
| Add the cellulose stain | The outer boundary is stained | No staining |
| Apply the same small force to each cell | The cells keep their shape | The cells change shape |
| Place the cells in a solution containing dissolved markers P and Q | P enters the cells but Q does not | P enters the cells but Q does not |
Explain which sample came from the potato and which sample came from the fish, using all the test results.
282 exam-style questions on AQA GCSE Biology 1.1 Cell structure, covering 1.1.1 Eukaryotes and prokaryotes, 1.1.2 Animal and plant cells, 1.1.3 Cell specialisation, 1.1.4 Cell differentiation, 1.1.5 Microscopy, and 1.1.6 Culturing microorganisms. Each one has a worked solution and a mark scheme showing where the marks go.