Multiple Choice
Which of the following are products of the Calvin Cycle?
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9. Photosynthesis
Calvin Cycle
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Which of the following correctly lists the order of the main phases of the Calvin cycle?
A
Carbon fixation → Reduction → Regeneration of RuBP
B
Reduction → Carbon fixation → Regeneration of RuBP
C
Regeneration of RuBP → Carbon fixation → Reduction
D
Carbon fixation → Regeneration of RuBP → Reduction
Verified step by step guidance1
Step 1: Begin by understanding the Calvin cycle, which is the set of chemical reactions that occur in the stroma of chloroplasts during photosynthesis. It is responsible for converting carbon dioxide into glucose using ATP and NADPH produced in the light-dependent reactions.
Step 2: Learn the three main phases of the Calvin cycle: Carbon fixation, Reduction, and Regeneration of RuBP. Each phase has distinct roles and processes.
Step 3: Carbon fixation is the first phase, where carbon dioxide is incorporated into a 5-carbon sugar called ribulose-1,5-bisphosphate (RuBP) by the enzyme RuBisCO, forming 3-phosphoglycerate (3-PGA).
Step 4: Reduction is the second phase, where ATP and NADPH are used to convert 3-PGA into glyceraldehyde-3-phosphate (G3P), a 3-carbon sugar. This step involves energy input and reduction reactions.
Step 5: Regeneration of RuBP is the final phase, where some of the G3P molecules are used to regenerate RuBP, allowing the cycle to continue. This step also requires ATP.
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