Answer :
Final answer:
Rubisco is an enzyme that catalyzes a reaction involving CO2, O2, and RuBP during the Calvin cycle of photosynthesis, thus, the correct answer is 'CO2, O2, and RuBP'.
Explanation:
The correct answer to the question is 'C) CO2, O2, and RuBP'. Rubisco substrates refer to the substances on which the enzyme rubisco acts during the process of photosynthesis, specifically during the Calvin cycle. In this biochemical sequence, the enzyme RuBisCO catalyzes a reaction involving the substrates ribulose bisphosphate (RuBP), carbon dioxide (CO2), and oxygen (O2). This reaction results in the formation of two molecules of a three-carbon compound known as 3-phosphoglycerate (3-PGA). This is part of the process known as carbon fixation, wherein CO2 is 'fixed' from an inorganic form into organic molecules.
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