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The Calvin Cycle takes place in the stroma of the chloroplasts
The Calvin Cycle is an endergonic process requiring energy
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uses NADPH as a source of high-energy electrons
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The Calvin cycle is anabolic, building carbohydrates from smaller molecules and consuming energy
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Three CO2(g) are used to produce a 3-carbon sugar called glyceraldehyde-3-phophate (G3P)
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The Calvin cycle is divided into 3 phases:
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See Slide
The products of this reaction are three 6-carbon sugars that are so unstable that they
immediately splits in half to form a total of six 3-carbon molecules
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Reduction (medium blue arrows): A phosphate from each of 6 ATPs and a pair of electrons
from each of 6 NADPH are used to produce 6 molecules of glyceraldehyde-3-phophate (G3P)
molecules
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The other 5 G3P remain in the Calvin cycle
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Regeneration of the carbon dioxide acceptor RuBP (dark blue arrows): The five
molecules of G3P that remain in the cycle are rearranged into three molecules of RuBP
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RuBP is now available to accept more carbon dioxide
and the Calvin cycle continues
5 G3P + 3 ATP (energy) 3 RuBP (used to fix 3 more incoming CO2)
Calvin Cycle continues
The one sugar is G3P (3 carbon sugar)