Biology 9700 · AS & A Level · Chromosome behaviour in mitosis

Chromosome behaviour in mitosis — practice question

Chromosome telomeres are necessary for DNA replication, and they are not entirely copied during mitosis. A substance X is known to replace telomeres completely during mitosis. What effect would be seen when cells are grown with substance X and when they are grown without substance X?

  • Awith substance X: cells divide continually; without substance X: cell division eventually slows and stops
  • Bwith substance X: cells divide more rapidly; without substance X: cells divide continually
  • Cwith substance X: cell division eventually slows and stops; without substance X: cell division stops immediately
  • Dwith substance X: cell division stops immediately; without substance X: cells divide continually

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