High School

Which order of molecular conversions is correct for the Calvin cycle?

A. RuBP + G3P → 3-PGA → sugar
B. RuBisCo → CO₂ → RuBP → G3P
C. RuBP + CO₂ → [RuBisCo] 3-PGA → G3P
D. CO₂ → 3-PGA → RuBP → G3P

Answer :

Final answer:

The correct order of molecular conversions for the Calvin cycle is RuBP+CO₂→[RuBisCo]3-PGA→G3P. In this process, RuBisCo incorporates carbon dioxide into an organic molecule called RuBP, forming 3-PGA. Then, with the help of ATP and NADPH, 3-PGA is converted to G3P.

Explanation:

The correct order of molecular conversions for the Calvin cycle is option C: RuBP+CO₂→[RuBisCo]3-PGA→G3P.

In stage 1 of the Calvin cycle, the enzyme RuBisCo incorporates carbon dioxide (CO₂) into an organic molecule, ribulose bisphosphate (RuBP), forming 3-phosphoglycerate (3-PGA).

In stage 2, using energy from ATP and NADPH generated during the light-dependent reactions, 3-PGA is converted to glyceraldehyde-3-phosphate (G3P). Some G3P molecules are used to build glucose, while the remaining G3P molecules regenerate RuBP, enabling the cycle to continue.

Learn more about Calvin cycle here:

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