A-LevelBiologyNucleic acids and protein synthesisMay/June 2022Paper 1 Q181 Mark
Telomeres prevent the loss of genes from the ends of chromosomes during DNA replication, but they become shorter each time they are copied. In cancer cells and stem cells, the telomeres remain the same length. Which statement is correct for all human cells?
AIf telomeres become too short, a cell may stop dividing.
BAdding telomeres could increase the rate of ageing of cells.
CTelomeres are repaired by the enzyme RNA polymerase.
DTelomeres prevent all damage occurring to DNA molecules.
✓ Correct Answer
The correct answer is A: If telomeres become too short, a cell may stop dividing.
📋 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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