A-LevelBiologyThe mitotic cell cycle9700/12 · May/June 2023 · Q201 Mark
The diagram shows part of the organisation of a section of a DNA molecule and the associated histones, P and R, in prophase of mitosis. [Figure 20.1] Which statement about the features labelled P, Q and R during prophase of mitosis is correct?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
AThe coiled DNA molecule forms Q and wraps around histone R to form small clusters held in place by histone P.
BThe groups of histones, P, and its associated DNA, Q, move closer together as the chromosome condenses around R.
CThe histones P and R are made of protein around which the DNA molecule, Q, is wrapped so that the DNA molecule can fit inside the nucleus.
DThe linked groups of histones P and R and the associated DNA, Q, form strands that fold and twist together to form a chromatid.
✓ Correct answer
D: The linked groups of histones P and R and the associated DNA, Q, form strands that fold and twist together to form a chromatid.
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