Answer :
Final answer:
Rubisco plays a crucial role in the Calvin cycle by incorporating carbon dioxide from the atmosphere into an organic molecule called RuBP. This process, known as carbon fixation, is the first stage of the cycle. Rubisco's primary role is to incorporate CO2 into an organic molecule, allowing the production of carbohydrate molecules.
Explanation:
Rubisco plays a crucial role in the Calvin cycle by incorporating carbon dioxide (CO2) from the atmosphere into an organic molecule called RuBP. This process is known as carbon fixation, and it is the first stage of the cycle. Rubisco catalyzes the reaction between CO2 and RuBP, resulting in the production of an intermediate molecule called 3-phosphoglycerate (3-PGA).
Once carbon dioxide is fixed, the Calvin cycle proceeds to the reduction stage, where ATP and NADPH are used to convert 3-PGA into glyceraldehyde 3-phosphate (G3P), a three-carbon sugar. Some G3P molecules are then used to build glucose, while the remaining G3P molecules are used to regenerate RuBP in the third stage.
Overall, Rubisco's primary role is to incorporate CO2 from the atmosphere into an organic molecule, enabling the Calvin cycle to produce carbohydrate molecules and sustain the process of photosynthesis.
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