Explain4 marksStandard
A muscle cell carries out active transport of calcium ions into the sarcoplasmic reticulum and also uses ATP for muscle contraction. Explain why ATP is described as the universal energy currency for such processes.
CAIE A Level Biology 9700 · Energy and respiration
Energy and respiration: explain question
How this question is marked
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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