A-LevelBiologyNucleic acids and protein synthesis9700/12 · May/June 2022 · 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
A: If telomeres become too short, a cell may stop dividing.
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