In the Calvin cycle, which molecule is regenerated from G3P to accept CO2?

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Multiple Choice

In the Calvin cycle, which molecule is regenerated from G3P to accept CO2?

In the Calvin cycle, the molecule that must be regenerated to accept CO2 is RuBP, ribulose-1,5-bisphosphate. After CO2 is fixed by the enzyme rubisco, it combines with RuBP to form 3-PGA. Through the use of ATP and NADPH, that product is converted into glyceraldehyde-3-phosphate (G3P). A portion of the G3P is then rearranged and rebuilt using ATP to regenerate RuBP, the molecule that can once again fix CO2 in the next round. This regeneration step is essential for the cycle to continue functioning. ATP provides the energy for this rebuilding, while NADPH supplies the reducing power for converting intermediates toward G3P.

In the Calvin cycle, the molecule that must be regenerated to accept CO2 is RuBP, ribulose-1,5-bisphosphate. After CO2 is fixed by the enzyme rubisco, it combines with RuBP to form 3-PGA. Through the use of ATP and NADPH, that product is converted into glyceraldehyde-3-phosphate (G3P). A portion of the G3P is then rearranged and rebuilt using ATP to regenerate RuBP, the molecule that can once again fix CO2 in the next round. This regeneration step is essential for the cycle to continue functioning. ATP provides the energy for this rebuilding, while NADPH supplies the reducing power for converting intermediates toward G3P.

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