RuBP stands for Ribulose-bisphosphate or more specifically ribulose-15-bisphosphate. RuBP is a modified 5 carbon sugar ribulose that also contains 2 phospates. In the Calvin-Benson cycle (sometimes called the dark reactions of photosynthesis) RuBP is the molecule that is bound to ##CO_2## during carbon fixation by the enzyme RuBisCO (Ribulose-bisphosphate corboxylase/oxygenase).
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