CAIE A Level Biology 9700 · Photosynthesis
In an experiment, a plant cell is supplied with carbon dioxide containing the radioactive isotope . A radioactive carbon atom is incorporated into a molecule of triose phosphate (TP) in the Calvin cycle.
Explain the sequence of events by which this carbon atom from becomes part of a TP molecule. In your answer, name the intermediate compounds and state the roles of ATP and reduced NADP.
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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