Page 187 - Photosynthesis: The Green Miracle

Harun Yahya

Carboxylation
(CO is added)
2
CO Phosphoglyceric acid
2
2 molecule Phosphorylation
(Phosphate is
Unbalanced 3-phosphoglycerate added.)
Ribulose biphosphate 6-carbon
(RuBP) molecule

2 molekül
1,3-biphosphoglycerate

Ribulose phosphate

The Calvin
Cycle
2 molecule
Glycerol 3-phosphate

Glycerol 3-phosphate
Destruction
The cycle continues (Hydrogen is
added.)
2 molecule
Glycerol 3-phosphate

Product (Glucose
is produced.)

The Calvin Cycle, which is a series of biochemical reactions that takes place in the stro-
ma, begins with carbon dioxide entering the stroma. (1) When carbon molecules bond to
the sugar molecules known as 5-RuBP, they form an unstable 6-carbon molecule. (2) This
6-carbon molecule immediately divides. forming two 3-phosphoglycerate (3PG) mole-
cules. (3) Phosphate is added to both molecules by ATP—a process known as phospho-
rylation. Two bisphosphoglycerate (BPG) molecules emerge as a result of phosphorilation.
(4) These are broken down by NAPDH and two glyceral-3-phosphate (G3P) molecules
emerge. (5) Part of this final product leaves the chloroplast and goes to the cytoplasm and
is again subjected to phosphorylation. The cycle thus returns to the initial 5-RuBP mole-
cule.

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