1 4.
The diagram shows a red blood cell. Describe and explain how red blood cells are adapted for the efficient uptake and transport of oxygen.
cell membrane
cytoplasm containing haemoglobin, which transports oxygen
[4 marks]
Cell division by mitosis 1.
Which of the following statements best describes mitosis? Tick one box. Mitosis produces two new cells that are identical to each other, and to the parent cell. Mitosis produces one old cell and one new cell that are identical. Mitosis produces two new cells that are genetically different. Mitosis produces some cells that have double the amount of chromosomes.
2.
[1 mark]
Give the total number of chromosomes you would expect to find in a human cell produced by mitosis. [1 mark]
3.
Draw one line from each stage of the cell cycle shown in the diagram to link it with the correct description of the cell cycle in the table. The cytoplasm and membrane divide and two identical cells are formed. The DNA replicates to form two copies of each chromosome. One set of chromosomes is pulled to each end of the cell and the nucleus divides. The cell grows. The number of sub-cellular structures, e.g. mitochondria, increases.
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