Final answer:
During carbon fixation in the Calvin cycle, 3-phosphoglycerate (3-PGA) is produced when the enzyme RuBisCO catalyzes a reaction between CO₂ and RuBP.
Step-by-step explanation:
The compound produced during carbon fixation in the Calvin cycle is 3-phosphoglycerate (3-PGA). Carbon fixation involves the enzyme ribulose bisphosphate carboxylase (RuBisCO), which catalyzes a reaction between carbon dioxide (CO₂) and ribulose bisphosphate (RuBP).
This reaction produces two molecules of 3-PGA for each CO₂ molecule that reacts with one RuBP molecule. Therefore, the correct answer to the question of which compound is produced during carbon fixation is A) PGA.