A-LevelBiologyThe mitotic cell cycle9700/12 · May/June 2020 · Q191 Mark

Which description of chromosome structure is correct?

Achromosome at the beginning of interphase consists of two identical chromatids, each containing one linear molecule of DNA.

BTelomeres are lengths of non-coding DNA found at one end of each chromatid to prevent loss of genes during cell division.

CThe two identical chromatids of a chromosome are held together by a centromere in which there is no DNA.

DThe very long DNA molecule of each chromatid is coiled and held together by proteins called histones.

✓ Correct answer

D: The very long DNA molecule of each chromatid is coiled and held together by proteins called histones.

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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 19.

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