What this practice covers
These questions are drawn from past CIE 0654 Co-ordinated Sciences papers and filtered to biological molecules. 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 biological molecules, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Saying carbohydrates contain nitrogen.
- Saying fats are made of amino acids, or proteins of glucose.
- Forgetting to heat Benedict's solution.
- Giving only the final colour instead of the change.
- Saying iodine goes black. It goes blue-black, from orange-brown.
- Saying an enzyme is killed rather than denatured.
- Pairing A with C, or G with T.
- Saying a gene is the same thing as a chromosome.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Biological molecules revision notes.