Answer :
All of the following statements about the Calvin cycle are correct except (a) G3P leaves the Calvin cycle to form sugar.
The Calvin cycle, also known as the Calvin-Benson cycle, is a light-independent process that takes place in the stroma of chloroplasts of the eukaryotic cell. The Calvin cycle is the main part of the dark phase of photosynthesis in which carbon dioxide, water, and ATP are used to make glucose. Carbon dioxide, RuBP, ATP, and NADPH are the reactants required for the Calvin cycle.
Glucose is ultimately used to produce cellular energy, and sugar is formed as a by-product. The Calvin cycle has three primary stages: carbon fixation, reduction, and regeneration. G3P, a three-carbon sugar molecule, is the direct precursor of glucose and fructose.
Glyceraldehyde 3-phosphate (G3P) is the major end-product of the Calvin cycle and serves as the starting point for the synthesis of other organic compounds within the chloroplast or exported to the cytoplasm. The correct statements about the Calvin cycle are: It is light-independent.ATP and NADPH are produced.
Carbon dioxide reacts with RuBP to form 3-PGA, which is then converted to 3PG. 1,3-bisphosphoglycerate (BPG) is produced by the reaction. BPG is then converted to G3P. Therefore, option (a) is correct.
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