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Photosynthesis
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The first event in the Calvin cycle is the attachment of carbon dioxide to the five carbon RuBP molecule, which ____________.
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A
1, 2 and 3 are correct
💡 Explanation:
The Calvin cycle begins with CO2 fixation by RuBP carboxylase (Rubisco), forming an unstable 6-carbon intermediate that splits into two 3-carbon PGA molecules. This reaction is enzyme-assisted and helps maintain the diffusion gradient for CO2 uptake.