A scientist counted the mitochondria in four types of cell. Her results are shown in Table 3.
Table: The mean number of mitochondria per cell in four types of cell
| Type of cell | Mean number of mitochondria per cell |
|---|---|
| Heart muscle cell | 4800 |
| Leg muscle cell | 1200 |
| Sperm cell | 75 |
| Mature xylem cell | 0 |
Calculate how many times more mitochondria a heart muscle cell contains than a leg muscle cell.
Suggest why a heart muscle cell contains more mitochondria than a leg muscle cell.
Explain why a mature xylem cell contains no mitochondria.
139 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.