What this practice covers
These questions are drawn from past CIE 9700 Biology papers and filtered to replication and division of nuclei and cells. You answer, you find out immediately whether you were right, and you get the reasoning for the correct option and for each distractor. Wrong answers go to a mistakes locker so you can come back to exactly those.
Practice is free. You need an account only so your progress and your mistakes are still there next time.
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What examiners see students get wrong here
These are the errors that cost marks on replication and division of nuclei and cells, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Calling interphase a resting stage. It is the longest and most active part of the cycle.
- Saying the chromosome number doubles in S phase. The DNA quantity doubles; the chromosome number does not.
- Saying telomeres stop the chromosome fraying. They exist so that the DNA lost at replication is non-coding.
- Saying high telomerase limits division. It allows more division.
- Saying cancer is caused by one mutation. Usually several are needed in the same cell line.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Replication and division of nuclei and cells revision notes.