Scientists investigate two samples of animal cells, P and Q. At the start, the cells in both samples are undifferentiated.
Cells from each sample are grown in several different culture conditions. The results are shown in the table.
| Sample | Number of cells at the start | Number of cells after 48 hours | Specialised cell types produced |
|---|---|---|---|
| P | 100 | 380 | red blood cells, white blood cells, nerve cells and muscle cells |
| Q | 100 | 240 | red blood cells and white blood cells |
Describe how the results show that both P and Q contain stem cells.
State which sample is most likely to contain embryonic stem cells.
A medicine slows mitosis in the stem cells in a person's bone marrow.
Describe how this would affect the replacement of the person's blood cells.
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.