What this practice covers
These questions are drawn from past CIE 9700 Biology papers and filtered to cells as the basic units of living organisms. 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 cells as the basic units of living organisms, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Answering "no nucleus" alone for the prokaryote difference, and omitting the absence of membrane-bound organelles.
- Saying prokaryotes have no ribosomes. They have ribosomes, and those ribosomes are 70S.
- Giving centrioles to plant cells, or chloroplasts to every plant cell including root cells.
- Calling the nuclear envelope a single membrane. It is double, and it is pierced by pores.
- Saying a virus is a small cell, or that a virus contains both DNA and RNA.
- Describing the function of the Golgi as "storage". It modifies, packages and exports.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Cells as the basic units of living organisms revision notes.