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In C₃ cycle, first stable product is:

A3-Phosphoglycerate (3-PGA, 3-carbon)
B6-carbon intermediate
CGlucose
DRuBP
Answer & Solution
Correct answer: A. 3-Phosphoglycerate (3-PGA, 3-carbon)
C₃ pathway named after 3C first stable product (3-PGA). The 6C intermediate from CO₂ + RuBP is unstable, immediately splits into two 3-PGA. Two 3-PGAs from each CO₂ fixation. Six fixations needed to make 1 glucose.
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