At which point is g3p removed from the calvin cycle to be used in the production of carbohydrates?
a. during photophosphorylation
b. during carbon fixation
c. immediately after reduction
d. immediately after regeneration

The answer is C. The Calvin cycle occurs in the stroma o the chloroplast in a plant cell. It involves the dark stage where carbon dioxide is reduced by protons created in photolysis from the light stage of photosynthesis. The 3-phosphoglyceric acid (3-PGA) is phosphorylated by ATP and then immediately reduced by NADPH in the reduction step. After reduction, G3P is formed and exits the cycle. Other G3Ps are regenerated into a ribulose-1,5-bisphosphate (RuBP) acceptor molecule for the cycle to continue.

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cell regulation is conducted by special proteins.