A student prepared two slides of cheek cells. The student added methylene blue to one slide and water to the other. The student used a light microscope to examine 20 cells on each slide and counted the cells in which the nucleus was clearly visible.
| Slide | Number of cells with a clearly visible nucleus |
|---|---|
| Methylene blue | 14 |
| Water | 5 |
The student concluded: 'Methylene blue makes every sub-cellular structure in cheek cells visible with a light microscope.'
Evaluate the student's conclusion.
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.