A) It participates in the Calvin cycle. 55) Which of the following is (are) true of the enzyme ribulose bisphosphate carboxylase? A) It participates in the Calvin cycle. B) It catalyzes a phosphorylation reaction. C) It has an affinity for both O2 and CO2. D) A and C are true. E) A, B, and C are true. 56) What are the substrates (normal reactants) for the enzyme RuBP carboxylase? Figure 10.2 57) Which of the following statements is true concerning Figure 10.2? A) It represents cell processes involved in C4 photosynthesis. B) It represents the type of cell structures found in CAM plants. C) It represents an adaptation that minimizes photorespiration. D) A and C are true. E) A, B, and C are true.