Why does production of one G3P require 3 turns of the Calvin cycle?
- A
Three turns are required to phosphorylate ATP
- B
Each turn produces 3 G3P molecules
- C
Three turns are needed to absorb one photon
- Dcheck_circle
Each turn fixes one CO2 (3 carbons total), and one 3-carbon G3P leaves while RuBP is regenerated
Explanation
Each turn of the Calvin cycle fixes one CO2. After three turns, three CO2 are added (giving net 3 carbons / 1 G3P out), with the rest used to regenerate RuBP.