Question:
Which one is the first stable product of C3 cycle soon after the uptake of CO2?
Which one is the first stable product of C3 cycle soon after the uptake of CO2?
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Think about what RuBP splits into right after RuBisCO acts on CO2.
Updated On: Jul 4, 2026
- 3-PGA
- DHAP
- 3-PGAl
- Phosphoribulose
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The Correct Option is A
Solution and Explanation
Step 1: In the C3 pathway, RuBisCO fixes CO2 onto the 5 carbon acceptor RuBP.
Step 2: This unstable 6 carbon intermediate splits immediately into two molecules of a 3 carbon compound.
Step 3: That 3 carbon compound is 3-phosphoglyceric acid (3-PGA), which is the first stable product formed right after CO2 fixation. DHAP and 3-PGAl (glyceraldehyde 3-phosphate) appear only later in the reduction phase of the cycle.
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