PHOTOSYNTHESIS
THE CALVIN CYCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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5-C compound (RuBP:Ribulose 1, 5-bisphosphate), C6H12O6
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Glucose, CO2
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ATP, Glucose
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Glucose, RUBP
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Detailed explanation-1: -One of the three-carbon molecules of G3P leaves the cycle to become a part of a carbohydrate molecule. The remaining G3P molecules stay in the cycle to be formed back into RuBP, which is ready to react with more CO2.
Detailed explanation-2: -5 G3P molecules are recycled, regenerating 3 RuBP acceptor molecules.
Detailed explanation-3: -Formation of one molecule of glucose (6C) requires 6 turns of Calvin cycle as 3 turns of carbon fixation obtains net one molecule of glyceraldehyde 3 phosphate (G3P; 3C) and two molecules of G3P are required to make one molecule of 6 carbon glucose.
Detailed explanation-4: -Stage 3: Regeneration Because the G3P exported from the chloroplast has three carbon atoms, it takes three “turns” of the Calvin cycle to fix enough net carbon to export one G3P. But each turn makes two G3Ps, thus three turns make six G3Ps.