A-LevelBiologyThe mitotic cell cycle9700/12 · May/June 2018 · Q351 Mark

What correctly describes the effect of carcinogens on lung tissue that causes a tumour to develop?

ACells in damaged alveoli walls divide more rapidly to replace damaged areas.

BCilia are paralysed and mucus accumulates in the lungs causing DNA to change.

CDNA changes, causing bronchial epithelial cells to divide by mitosis in an uncontrolled way.

DHaemoglobin carries less oxygen, causing bronchial cells to divide by mitosis in an uncontrolled way.

✓ Correct answer

C: DNA changes, causing bronchial epithelial cells to divide by mitosis in an uncontrolled way.

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Topic: The mitotic cell cycle, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, May/June 2018 Paper 1 Variant 2, question 35.

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