Answer :
Final answer:
During carbon fixation in the Calvin cycle, the molecule produced first is 3-phosphoglycerate (3-PGA), formed from CO₂. This process is vital for converting inorganic carbon into organic compounds, such as sugars. The key steps involve RuBP as a reactant, leading to the production of G3P.
Explanation:
Understanding Carbon Fixation in the Calvin Cycle
During the process of carbon fixation, the primary aim is to convert carbon dioxide (CO₂) into organic compounds. In this biochemical pathway known as the Calvin cycle, the first stable product formed from the fixation of CO₂ is 3-phosphoglycerate (3-PGA). This three-carbon compound is subsequently converted into other sugars, including glyceraldehyde-3-phosphate (G3P), which can further be processed to form glucose and other carbohydrates.
The sequence of reactions begins when RuBP (ribulose bisphosphate) combines with CO₂ in the presence of the enzyme RuBisCO, leading to the formation of the unstable intermediate that quickly breaks down into 3-PGA. The production of G3P occurs later in the cycle, utilizing ATP and NADPH generated from the light-dependent reactions of photosynthesis.
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