Scientists examine two samples of laboratory-grown skin cells.
They record the number of cells in anaphase, when sister chromatids are being pulled towards opposite ends of the cell.
| Sample | Total number of cells counted | Number of cells in anaphase | Duration of one cell cycle in hours |
|---|---|---|---|
| P | 2400 | 20 | 24 |
| Q | 1800 | 30 | 30 |
Assume that the proportion of cells observed in anaphase is equal to the proportion of the cell cycle spent in anaphase.
Estimate how many minutes longer anaphase lasts in sample Q than in sample P.
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.