A scientist measures the time spent in each part of the cell cycle.
Table
| Cells | Interphase / hours | Mitosis and cytokinesis / hours |
|---|---|---|
| Untreated | 18 | 2 |
| Treated | 8 | 2 |
Both cultures start with 100 cells. All cells divide at the stated intervals and no cells die.
What is the ratio of treated cells to untreated cells after 40 hours?
1:11:11:1
4:14:14:1
2:12:12:1
8:18:18:1
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.