A-LevelBiologyThe mitotic cell cycle9700/12 · May/June 2020 · Q211 Mark

A drug has been developed to treat certain types of cancer. It prevents mitosis by binding to the spindle and preventing sister chromatids being separated and moving to opposite poles of the cell. The photomicrograph shows cells in different phases of mitosis. [Figure 21.1] What represents the stages of mitosis that will be able to occur in a cell which is entering prophase when treated with this drug?

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A1 and 2

B2 and 3

C2 only

D3 and 4

✓ Correct answer

A: 1 and 2

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Topic: The mitotic cell cycle, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, May/June 2020 Paper 1 Variant 2, question 21.

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