Cancer can develop in the skin.
Describe how cancer develops.
Explain why a tumour forms when cells divide out of control.
Scientists grew normal skin cells and skin cancer cells in the laboratory.
The Table shows the time taken for the number of each type of cell to double.
Table
| Type of cell | Time taken for number of cells to double in hours |
|---|---|
| normal skin cell | 48 |
| skin cancer cell | 24 |
Each sample started with one cell.
Calculate how many more cells there are in the skin cancer cell sample than in the normal skin cell sample after 96 hours.
42 exam-style questions on Edexcel GCSE Biology 2.1 Cell division and growth, covering 2.1.1 Mitosis and the cell cycle, 2.1.2 Division producing identical daughter cells, 2.1.3 Cancer and uncontrolled cell division, 2.1.4 Growth in animals and plants, 2.1.5 Importance of cell differentiation, and 2.1.6 Percentile charts to monitor growth. Each one has a worked solution and a mark scheme showing where the marks go.