Question

why we used three molecule of ribulose biphosphate in Calvin cycle​

Answer 1

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Of the six molecules of GP formed, only one represents net sugar output. The other five GP molecules are used to regenerate the three 5-carbon molecules of RuBP required to sustain the cycle. Thus, the Calvin cycle uses ATP and NADPH to convert three molecules of CO2 to one molecule of a 3-carbon sugar.

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