In the first reaction of carbon dioxide fixation in photosynthesis, CO₂ reacts with A) ribulose 5-phosphate. B) ribulose 1,5- bis phosphate. C) ribose 5-phosphate. D) xylulose 5-phosphate. E) glyceraldehyde 3-phosphate

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In the first step of carbon dioxide fixation in the Calvin cycle of photosynthesis, carbon dioxide reacts with ribulose 1,5-bisphosphate (RuBP). This reaction is catalyzed by the enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase, commonly known as RuBisCO.

In the First Reaction of Carbon Dioxide Fixation in Photosynthesis