What is carbon fixation?
AConverting organic carbon into stored starch
BConverting carbon dioxide into organic compounds
CConverting organic compounds into carbon dioxide
DConverting carbon dioxide into free oxygen gas
Answer & Solution
Correct answer: B. Converting carbon dioxide into organic compounds
1. Carbon fixation is the process of converting inorganic carbon dioxide gas into organic compounds.
2. The carbon is described as fixed because it moves from an inorganic form into organic molecules.
3. RuBisCO performs that step by joining carbon dioxide to the five-carbon acceptor.
4. Converting organic compounds back into carbon dioxide is respiration, which runs the other way.
_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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