For the net export of one molecule of triose phosphate (G3P) from the Calvin cycle, how many turns of the cycle are needed?
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Correct answer: 3
To export one 3-carbon triose phosphate without depleting the cycle's intermediates, 3 turns are required (fixing 3 CO2). This produces 6 molecules of G3P, 5 of which are used to regenerate RuBP, leaving 1 for export.
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