Answer :
Final answer:
The primary compound produced during carbon fixation is PGA (3-phosphoglycerate). It is formed when carbon dioxide is fixed by RuBisCO and combines with RuBP. Although G3P is also produced later in the cycle, PGA is the initial product during carbon fixation.
Explanation:
Carbon Fixation and Its Products
During the process of carbon fixation, the primary compound produced is PGA (3-phosphoglycerate). This occurs during the Calvin cycle of photosynthesis, which takes place in the stroma of chloroplasts. Carbon dioxide is fixed by the enzyme RuBisCO and combines with RuBP (ribulose bisphosphate), leading to the formation of PGA.
After its production, PGA can be converted through a series of reactions into G3P (glyceraldehyde-3-phosphate), which is a key precursor for the synthesis of glucose and other carbohydrates. In summary, while PGA is the initial product of carbon fixation, G3P can also be considered a significant compound produced as a result of subsequent reactions.
Conclusion
Therefore, the correct answer to the question is PGA, with G3P being produced later in the cycle.
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