Researchers produce two groups of red blood cells from the same starting cells. Cells in group N lose their nuclei as they mature. Cells in group R retain their nuclei.
Each sample contains 1.0 × 1012 red blood cells.
| Group | Total mass of haemoglobin in the sample in g | Maximum volume of oxygen carried in cm3\text{cm}^3cm3 |
|---|---|---|
| N | 30.0 | 40.2 |
| R | 22.0 | 29.5 |
Calculate the percentage decrease in the maximum volume of oxygen carried from group N to group R.
Give your answer to three significant figures.
Explain why the presence of a nucleus accounts for the difference in the maximum volume of oxygen carried by groups N and R.
Use calculations from the data in your answer.
114 exam-style questions on OCR GCSE Biology 2.2 The challenges of size, covering 2.2.1 Exchange surfaces and surface area : volume ratio, 2.2.2 Substances transported in organisms, 2.2.3 The human circulatory system, 2.2.4 The heart and blood vessels, 2.2.5 Red blood cells and plasma, 2.2.6 Uptake of water and mineral ions by plants, 2.2.7 Transpiration and translocation, 2.2.8 Xylem and phloem, 2.2.9 Environmental factors and water uptake, and 2.2.10 Using a potometer. Each one has a worked solution and a mark scheme showing where the marks go.