A-LevelBiologyThe mitotic cell cycle9700/12 · Oct/Nov 2017 · Q191 Mark

The photomicrographs show cells in various stages of the cell cycle. In which stage does semi-conservative replication of DNA take place? [Figure 19.1 - four photomicrographs A, B, C, D]

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APhotomicrograph showing condensed chromosomes, seemingly in prophase.

BPhotomicrograph showing chromosomes aligned at the metaphase plate.

CPhotomicrograph showing a nucleus with decondensed chromatin and visible nucleolus.

DPhotomicrograph showing condensed chromosomes, possibly early prophase or late telophase.

✓ Correct answer

C: Photomicrograph showing a nucleus with decondensed chromatin and visible nucleolus.

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Topic: The mitotic cell cycle, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2017 Paper 1 Variant 2, question 19.

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