In the reduction stage, six molecules of 3-PGA are converted into six molecules of which compound?
APhosphoenolpyruvate
BFructose-6-phosphate
CGlyceraldehyde 3-phosphate
DRibulose bisphosphate
Answer & Solution
Correct answer: C. Glyceraldehyde 3-phosphate
1. Adenosine triphosphate and NADPH are spent during the second stage of the cycle.
2. They convert the six molecules of 3-PGA into six molecules of glyceraldehyde 3-phosphate.
3. That is a reduction reaction, because it involves the gain of electrons by 3-PGA.
4. Ribulose bisphosphate is rebuilt only in the third stage, so it cannot be the product here.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 8 "Photosynthesis", section 8.3 Using Light Energy to Make Organic Molecules_
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