alleryRuBP, the molecule that starts the Calvin cycle, has how many carbon atoms?
ASeven
BFive
CNine
DFour
Answer & Solution
Correct answer: B. Five
1. It is flanked by two phosphates.
2. RuBP has five carbons.
3. Adding CO2 gives two three-carbon 3-PGA.
_Source: OpenStax Biology 2e, Chapter 8, Photosynthesis (CC BY 4.0)._
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