A-LevelBiologyThe mitotic cell cycleFeb/Mar 2025Paper 1 Q231 Mark
Telomerase is an enzyme that prevents the shortening of telomeres. It is not present in most normal cells, but is active in an estimated 85% to 95% of human tumour cells. Which statement explains the effect of telomerase on human tumour cells?
ATelomerase triggers a self-destruct process, known as apoptosis, ending the life of the cell.
BTelomerase damages the chromosomes so they become genetically unstable and are unable to replicate and divide.
CTelomerase helps human tumour cells avoid senescence, or cell death, which is usually the expected consequence of repeated cell division.
DTelomerase enables the human tumour cells to divide more rapidly by reducing the time taken for a complete mitotic cell cycle.
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The correct answer is C. 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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