Explain c3 cycle

1.	Explain c3 cycle
Answer» The Calvin cycle can be described under three stages: carboxylation, reduction and regeneration.Carboxylation: Fixation of CO2 into a stable organic intermediate is called carboxylation. In this step, carbon dioxide is utilised for the carboxylation of RuBP. The enzyme RuBP carboxylase catalyses this reaction. The reaction results in the formation of two molecules of 3-PGA. This enzyme is also called RuBP carboxylase-oxygenase or RuBisCO; because it also has an oxygenation activity.Reduction: This step involves utilization of 2 molecules of ATP for phosphorylation and two of NADPH for reduction of each CO2 molecule fixed. For the removal of one molecule of glucose from the pathway, fixation of six molecules of CO2 and 6 turns of the cycle are required.Regeneration: This step involves regeneration of CO2 acceptor molecule RuBP. This is necessary for the cycle to continue without interruption. This step requires one ATP for phosphorylation to form RuBP.\xa0

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