CAIE A Level Biology 9700 · Energy and respiration

Energy and respiration: describe question

Describe5 marksStandard

Describe the process of lactate fermentation in mammalian muscle cells during vigorous exercise. Also, explain why the yield of ATP per molecule of glucose is much lower in lactate fermentation compared to aerobic respiration.

How this question is marked

5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.

Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.

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