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The Light-independent Reactions (Calvin Cycle)

The molecules of the Calvin Cycle:

Carbon dioxide (CO2) ­ Enters the leaf through the stomata from the air, then enters the
stroma of the chloroplast. It is fixed to RuBP.

Ribulose bisphosphate (RuBP) ­ a 5-carbon sugar. It is the CO2 acceptor in the…

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The Calvin Cycle Process:

Carbon fixation:

CO2 enters the stroma of the chloroplast via the stomata in the leaves. Rubisco fixes CO2 to
RuBP to create an unstable 6-carbon molecule that instantly splits into two 3-carbon
molecules of 3-PG.
ATP phosphorylates each 3-PG molecule, creating 1,3-bisphosphoglycerate. This results in…

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For every six molecules of G3P created five molecules continue on to phase 3 while one
leaves to be used for organic compounds. ATP is once again needed for regeneration of
RuBP by phosphorylation of G3P.


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