CAIE A Level Biology 9700 · Energy and respiration
A student investigates aerobic respiration in yeast using a respirometer. At 35°C, the oxygen uptake is highest. The student also examines electron micrographs of mitochondria and observes extensive folding of the inner membrane into cristae.
Describe the four stages of aerobic respiration, stating where each stage occurs in the cell and explaining how the structure of the mitochondrion supports the final stage of the process.
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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