Fig. 1 shows cells taken from a biopsy of a person with a tumour in the colon. The drawing compares a small area of normal tissue with an area containing tu...
Question 1 Report
Fig. 1 shows cells taken from a biopsy of a person with a tumour in the colon. The drawing compares a small area of normal tissue with an area containing tumour cells. In the tumour, cells are crowded, irregular in shape and some are dividing. A doctor explains that a tumour can become dangerous when cells enter the blood or lymph and form another growth elsewhere in the body.
(a) Identify the name for uncontrolled cell division that can form a tumour. [1]
(b) Use Fig. 1 to identify one difference between normal cells and tumour cells. [1]
(c) Explain how mitosis causes a tumour to increase in size. [2]
(d) Explain why cancer cells moving in the blood can be serious. [2]
Answer Details
(a) Cancer [1] (b) Tumour cells are more crowded / irregular in shape / show more dividing cells [1] (c) Mitosis produces two daughter cells from one cell [1]; repeated divisions increase the number of cells [1] (d) Cells can be carried to another part of the body [1]; where they may divide and form secondary tumours / damage organs [1]
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