During CO₂ fixation, CO₂ combines with A) NADPH. B) 3PG. C) G3P. D) water. E) 1,5-ribulose bisphosphate.

Question

Quizplus · Accepted Answer

During CO₂ fixation, CO₂ combines with 1,5-ribulose bisphosphate to form an unstable 6-carbon compound that immediately splits into two 3-carbon molecules, 3-phosphoglycerate (3PG) and glyceraldehyde 3-phosphate (G3P). Therefore, the best choice is E, 1,5-ribulose bisphosphate, since it is the molecule that CO₂ combines with during fixation.

During CO2 Fixation, CO2 Combines with

During CO₂ Fixation, CO₂ Combines with