Which of the following correctly describes the role of rubisco in the Calvin cycle?

A. Rubisco uses NADPH to reduce 3-phosphoglycerate to a three-carbon sugar.
B. Rubisco uses ATP to regenerate RUBP.
C. None of the other answer options is correct.
D. Rubisco incorporates CO2 from the atmosphere into an organic molecule.

Rubisco, an enzyme in the Calvin cycle, incorporates carbon dioxide from the atmosphere into an organic molecule. This is the first major step of carbon fixation and an important part of photosynthesis.

Explanation:

The role of rubisco in the Calvin cycle is correctly described in option D: Rubisco incorporates CO2 from the atmosphere into an organic molecule. More specifically, rubisco (short for Ribulose-1,5-bisphosphate carboxylase/oxygenase) is the enzyme responsible for the first major step of carbon fixation; it converts inorganic carbon (CO2) to an organic molecule (3-PGA or 3-phosphoglycerate).

This is a fundamental process in the Calvin cycle, which is part of photosynthesis, where plants and some other organisms use sunlight to produce food and oxygen from carbon dioxide and water.

Learn more about Rubisco in the Calvin cycle here:

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