A-LevelBiologyThe mitotic cell cycleOct/Nov 2025Paper 1 Q231 Mark
The photomicrograph shows 17 cells in different stages of the mitotic cell cycle. [Photomicrograph of cells in different mitotic stages, with cell 1 highlighted] Which row is correct for this photomicrograph?
Athe role of a centromere in cell 1: attaches daughter chromosomes to spindle fibres, the proportion of the cells in the photomicrograph in telophase: > 0.2
Bthe role of a centromere in cell 1: holds sister chromatids together, the proportion of the cells in the photomicrograph in telophase: > 0.2
Cthe role of a centromere in cell 1: attaches daughter chromosomes to spindle fibres, the proportion of the cells in the photomicrograph in telophase: < 0.2
Dthe role of a centromere in cell 1: holds sister chromatids together, the proportion of the cells in the photomicrograph in telophase: < 0.2
✓ Correct Answer
The correct answer is A. This question tests the candidate's understanding of the mitotic cell cycle within the Biologysyllabus. The examiner's mark scheme requires...
📋 Examiner Report & Trap Analysis
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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