Final answer:
In the light-independent reactions of photosynthesis, when CO2 is added to RuBP, the product is 3-phosphoglycerate (3-PGA).
Step-by-step explanation:
In the light-independent reactions of photosynthesis, when CO2 is added to a molecule of Ribulose 1,5-bisphosphate (RuBP), the product is 3-phosphoglycerate (3-PGA).
This is achieved through the catalytic action of the enzyme ribulose bisphosphate carboxylase (RuBisCO). For each CO2 molecule that reacts with one RuBP, two molecules of 3-PGA are formed. 3-PGA has three carbons and one phosphate.
It's important to note that the light-independent reactions also involve reduction and regeneration stages, but the direct product of the reaction between CO2 and RuBP is 3-PGA.