PHOTOSYNTHESIS
THE CALVIN CYCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They are used to make glucose.
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They are reshuffled to make CO2 by adding ATP.
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They exit the cycle.
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They are reshuffled to make 5-C compound (RuBP:Ribulose 1, 5-bisphosphate) by adding ATP.
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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. Photosynthesis forms a balanced energy cycle with the process of cellular respiration.
Detailed explanation-2: -Regeneration. One G3P molecule leaves the cycle and will go towards making glucose, while five G3Ps must be recycled to regenerate the RuBP acceptor. Regeneration involves a complex series of reactions and requires ATP.
Detailed explanation-3: -The three-carbon triose phosphate is transformed into six-carbon fructose-6-phosphate (F6P) in two steps: The condensation of G3P and DHAP by the enzyme aldolase. This reaction results in a six-carbon molecule, fructose-1, 6-bisphosphate (FBP).
Detailed explanation-4: -Carbon Fixation GP is reduced to triose phosphate (TP) in a reaction involving reduced NADP and ATP. RuBP is regenerated from TP in reactions that use ATP.