What this practice covers
These questions are drawn from past CIE 9700 Biology papers and filtered to carbohydrates and lipids. 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 carbohydrates and lipids, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Saying starch is made of glucose without specifying α-glucose. The isomer is the point.
- Explaining cellulose strength as coming from the glycosidic bonds. It comes from hydrogen bonds between adjacent chains.
- Saying glycogen is branched "so it is compact". Branching is about the rate of glucose release.
- Calling a triglyceride bond a glycosidic bond. It is an ester bond.
- Saying lipids contain more energy "because they are bigger". Per gram, it is the higher proportion of hydrogen that matters.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Carbohydrates and lipids revision notes.