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Light-independent reactions
3.3 Stage two of photosynthesis: the Calvin cycle
The light-independent stage of photosynthesis is the second and final set of reactions. It is named so because the
reactions involved do not need light to occur, and so technically can take place without light. However, the products (ATP…

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3 The GP molecules are reduced (using two hydrogen atoms donated by reduced NADP from the light-dependent stage)
and then phosphorylated (using an inorganic phosphate group from one molecule of ATP, also from the light-
dependent stage) to form another three-carbon compound called triose phosphate (either TP or GALP)


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