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Calvin cycle. The Calvin cycle (also known as Calvin-Benson cycle) is a series of biochemical reactions taking place in the chloroplasts of photosynthetic organisms. It was discovered by Melvin Calvin and Andy Benson at the University of California, Berkeley. It is one of the light-independent reactions and occurs in the stroma.
Reactions of the Calvin Cycle In a series of reactions (figure 10.19), three molecules ofCO 2 are fixed by rubisco to produce six molecules of PGA(containing 6 Ã 3 = 18 carbon atoms in all, three from CO 2 and 15 from RuBP).