Answer :
Final answer:
The compound produced during the regeneration phase of the Calvin cycle is glyceraldehyde-3-phosphate (G3P), which is primarily used to regenerate ribulose bisphosphate (RuBP). This process is crucial for the continuation of the cycle, allowing plants to fix carbon dioxide efficiently. Without this regeneration, the photosynthesis process would halt.
Explanation:
Understanding Regeneration in the Calvin Cycle
During the Calvin cycle in photosynthesis, a key phase is the regeneration of ribulose bisphosphate (RuBP), which is essential for the cycle to continue. This process primarily uses the compound glyceraldehyde-3-phosphate (G3P) produced in earlier steps of the cycle.
The cycle begins with the fixation of carbon dioxide by the enzyme ribulose bisphosphate carboxylase, also known as rubisco. This reaction produces 3-phosphoglycerate (PGA), which is subsequently converted to G3P with the help of ATP and NADPH from the light-dependent reactions.
- For every six molecules of CO₂ entering the cycle, two molecules of G3P are produced.
- Ten out of the twelve G3P molecules produced are utilized to regenerate RuBP, thereby allowing the cycle to continue.
- It takes the energy from ATP to convert some G3P back into RuBP.
This regeneration ensures that the Calvin cycle can continue to fix CO₂ and synthesize valuable organic compounds for the plant.
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