A-LevelBiologyThe mitotic cell cycleMay/June 2020Paper 1 Q211 Mark
A drug has been developed to treat certain types of cancer. It prevents mitosis by binding to the spindle and preventing sister chromatids being separated and moving to opposite poles of the cell. The photomicrograph shows cells in different phases of mitosis. [Figure 21.1] What represents the stages of mitosis that will be able to occur in a cell which is entering prophase when treated with this drug?
A1 and 2
B2 and 3
C2 only
D3 and 4
✓ Correct Answer
The correct answer is A: 1 and 2
📋 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...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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