A scientist examines cells from the growing shoot tip of a sunflower seedling.
| Observation | Value |
|---|---|
| Total number of cells counted | 960 |
| Number of cells in mitosis | 120 |
| Time taken for mitosis | 1.5 hours |
Assume that the proportion of cells in mitosis is proportional to the proportion of the cell cycle spent in mitosis.
Estimate the time taken for one complete cell cycle.
8.08.08.0 hours
1.51.51.5 hours
0.190.190.19 hours
121212 hours
194 exam-style questions on OCR GCSE Biology 2.1 Supplying the cell, covering 2.1.1 Transport across cell membranes, 2.1.2 Mitosis and the cell cycle, 2.1.3 Importance of cell differentiation, and 2.1.4 Stem cells. Each one has a worked solution and a mark scheme showing where the marks go.