Which of the following correctly identifies a role of the ATP produced in the light-capturing reactions?

A. It is used by rubisco to fix CO₂ to RuBP.
B. It serves the same role as ATP produced by mitochondria.
C. It is used to regenerate RuBP from G3P molecules.
D. It is used to produce G3P molecules.

Answer :

Out of the given options, the following correctly identify a role of the ATP produced in the light-capturing reactions are:

T: It is used to regenerate RuBP from G3P molecules.

T: It is used to produce G3P molecules.

During the light-dependent reactions of photosynthesis, ATP is generated through the process of photophosphorylation. ATP plays a crucial role in the Calvin cycle, which is the light-independent reaction of photosynthesis. In the Calvin cycle, ATP is utilized in the regeneration of ribulose-1,5-bisphosphate (RuBP) from glyceraldehyde-3-phosphate (G3P) molecules. This regeneration is important for the continuation of the carbon fixation process, as RuBP is required as a substrate for the enzyme rubisco to fix carbon dioxide (CO2) and initiate the synthesis of organic molecules.

Therefore, the correct roles of ATP produced in the light-capturing reactions are its involvement in the regeneration of RuBP from G3P molecules and the production of G3P molecules during the Calvin cycle.

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