Carbon Calvin Cycle Unstable 3 Carbon Molecules Co2 Diffuses

calvin cycle

- CO2 diffuses through stoma, and into stroma (where it combines with RuBP, which is 5 carbon compound, which fixes c in CO2, and so it can be incorperated into organic molecules) to form unstable 6 carbon intermediate, catalysed by RuBisCO, which is competitevely inhibited by O2, and so lots needed (meaning its inefficient)

- the unstable 6 carbon compound immediately breaks down into 2 3-carbon GP molecules (glycerate-3-phosphate), using H2 from reduced NADP and ATP to supply energy, it forms 2 3-carbon TP molecules (triose phosphate)