Answer :
Final answer:
Three turns of the Calvin cycle produce six G3P molecules. One G3P is used by the plant for other compounds while the remaining five G3Ps are converted back into three RuBP molecules using three ATP molecules. This process enables the lifecycle to continue fixing additional CO2.
Explanation:
The content loaded three turns of the Calvin cycle nets one G3P because the remaining G3Ps are recycled to regenerate RuBP. Each turn of the Calvin cycle generates two G3Ps, so after three turns, there are a total of six G3Ps. One G3P exits the cycle to contribute to other compounds needed by the plant, while the remaining five G3P molecules are utilized to regenerate RuBP, preparing the cycle to fix more CO2. This regeneration process requires energy, harnessed in the form of ATP molecules. Specifically, the five remaining G3P molecules, with the aid of three ATP molecules, are converted back to three molecules of RuBP. The regeneration of RuBP is essential because it allows the Calvin cycle to continue fixing carbon dioxide and producing organic molecules. This cyclic process ensures the sustained production of carbohydrates, which are crucial for the plant's growth and metabolism.
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