CAIE A Level Biology 9700 · Energy and respiration
During aerobic respiration, the movement of protons across the inner mitochondrial membrane is essential for ATP production.
Explain how the proton gradient across the inner mitochondrial membrane is established and how it is used to synthesise ATP. Include reference to the structure of the inner membrane in your answer.
4 marks, so the mark scheme is looking for about 4 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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