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No, carbon dioxide molecules enter the Calvin cycle within the chloroplasts of plant cells. The stomata on the leaves allow carbon dioxide to diffuse into the leaf where it can be fixed into organic molecules during photosynthesis.
Actually, carbon dioxide molecules enter the Calvin cycle (light-independent reactions) of photosynthesis, not the light-dependent reactions. In the Calvin cycle, carbon dioxide is converted into glucose with the help of ATP and NADPH produced during the light-dependent reactions.
What
Carbon dioxide molecules enter the light-dependent reactions of photosynthesis through tiny pores on the underside of leaves called stomata. Once inside the leaf, carbon dioxide diffuses into the chloroplasts where it participates in the Calvin cycle to produce sugars.
== == Technically speaking, three turns of the Calvin cycle produce one Glyceraldehyde-3-phosphate (G3P). Each turn of the Calvin Cycle uses 1 CO2. So three CO2 (3 cycles) for 1 G3P. Since 2 G3P are needed for 1 molecule of glucose = six molecules of CO2. As a side note, for one molecule of glucose= requires 6 CO2 + 18 molecules of ATP + 12 molecules of NADPH. (Source: Campbell and Reece, 2005)
glucose
The Calvin cycle is a series of reaction that regenerates its starting material after molecules enter and leave the cycle. It builds carbohydrates (specifically, the sugar glyceraldehyde-3-phosphate) from smaller molecules and consumes energy. To do this, the Calvin cycle uses ATP as an energy source and consumes NADPH as reducing power.
The source of carbon for the light-dependent reactions in photosynthesis is carbon dioxide (CO2) from the atmosphere. In these reactions, carbon dioxide is converted into organic molecules by using energy from sunlight.
One mole of glucose requires six moles of CO2 to enter the Calvin cycle for its synthesis.
Carbon dioxide ;D and carbon dioxide leaves it. 8)
stomata
stomata