Occurs in the stroma of chloroplasts
6 turns of the Calvin cycle are needed to make one hexose sugar
Rubp is regenerated constantly
Requires ATP and H ions
Carbon dioxide diffuses into the stroma and combines with a substance called RUBP (ribulose biphosphate) to create an unstable 6-carbon molecule. The enzyme rubisco catalyses this
The 6 carbon molecule splits into 2 molecules of glycerate-3 phosphate
ATP and reduced NADP from the LDS are used to reduce glycerate 3 phosphate to triose phosphate. The H ions from NADP help this. The triose phosphate is used for organic compounds or to regenerate RUBP
3/6 of the TP molecules are used to regenerate RUBP and this uses up the rest of the ATP from the LDS
6 turns of this creates one hexose sugar such as glucose which can then be respired
