During dark reaction the three carbon atoms of 3-PGA are derived from
A. RuBP only
B. CO2 only
C. RuBP + CO2
D. RuBP + CO2 - PEP
Answer: Option C
Solution(By Examveda Team)
During the dark reaction, the three carbon atoms of 3-PGA are derived from RuBP + CO2.Dark reactions of photosynthesis are a series of chemical reactions that convert carbon dioxide and hydrogen-carrier compounds into glucose. This is because the process requires NADPH, which is short-lived and comes from light-dependent reactions.
The CO2 that is captured by enediol produces an unstable six-carbon compound called 2-carboxy 3-keto 1,5-biphosphoribotol that immediately splits into 2 molecules of 3-phosphoglycerate , a 3-carbon compound. Two 3-PGAs are produced for every CO2 that enters the cycle, so this step utilizes two ATP per CO2 fixed.
Related Questions on Plant Pathology
Which photosynthetic bacteria possess both PS I and PS II?
A. Purple sulphur bacteria
B. Cyanobacteria
C. Purple nonsulphur bacteria
D. Green sulphur bacteria
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