Explain6 marksChallenge
Explain why lipids provide more energy per gram than carbohydrates when used as respiratory substrates. In your answer, refer to the role of ATP as a universal energy currency and the need for energy in living organisms.
CAIE A Level Biology 9700 · Energy and respiration
Energy and respiration: explain question
How this question is marked
6 marks, so the mark scheme is looking for about 6 separate creditworthy points. Making the same point twice in different words earns it once.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
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