A-LevelBiologyThe mitotic cell cycleMay/June 2023Paper 1 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?
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
The correct answer is D. This question tests the candidate's understanding of the mitotic cell cycle within the Biologysyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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