Where does the Calvin cycle occur?


Quick Answer

The Calvin cycle is a metabolic pathway that is found in the stroma of the chloroplast. Carbon enters the pathway in the form of CO2 and exits in the form of sugar.

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Full Answer

The Calvin cycle spends ATP as an energy source and consumes NADPH2 as a reducing power for adding high-energy electrons to make sugar. There are three phases in the Calvin cycle. Phase one is carbon fixation. In phase one, CO2 is incorporated into ribulose bisphosphate (RuBP), which is a five carbon sugar. Phase two is the reduction phase, in which ATP and NADPH2 from the light reactions are used to convert three-phosphoglycerate to three-phosphate. Also, the three-carbon carbohydrate precursor is converted to glucose and other sugars. Phase three is regeneration, in which more ATP is used to convert some of the pool of glyceraldehyde three-phosphate back to ribulose bisphosphate and the acceptor for CO2.

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