Dark reactions of C3 Photosynthesis?

In terms of the dark reaction of C3 photosynthesis, what is the first cellular hydrocarbon to receive atmospheric carbon dioxide? What is the ultimate fate of this molecule, once this happens?

Anonymous2012-02-06T08:03:20Z

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CO2 comes into the stroma of the chloroplast via the stomata of the leaves. Rubisco catalyzes the bonding of CO2 to RuBP to create an unstable 6-carbon molecule that instantly splits into two 3-carbon molecules of 3-PG.

Rest of Calvin Cycle in link.