The first stable product of C3 cycle is
The first stable product of C3 cycle is
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Correct Answer: Option D
Explanation
The Calvin cycle (light-independent reactions, dark reactions) of C3 photosynthesis: Step 1 (Carbon fixation):(ribulose-1,5-bisphosphate, C5)[unstable 6-carbon intermediate, C6]2 molecules of 3-phosphoglycerate (3-PGA, C3). 3-PGA is the FIRST STABLE product because the C6 intermediate is immediately hydrolysed. Subsequent steps: 3-PGAglyceraldehyde-3-phosphate (G3P)RuBP regenerated. For every 3 COfixed: 6 G3P produced, 5 used to regenerate 3 RuBP, 1 G3P net output for sugar synthesis. RuBisCO (ribulose-1,5-bisphosphate carboxylase/oxygenase) is the most abundant protein on Earth.