Calvin and colleagues determined the pathway of carbohydratesynthesis in plants by studying the incorporation of radioactivecarbon dioxide into biological compounds. Suppose that photosynthesis is proceeding at a steady pace in a typicalexperiment with the lights on, and carbon dioxide is being combinedwith ribulose-bisphosphate (RuBP) to produce 3-phosphoglycerate(3PG). Then suddenly the source of carbon dioxide is eliminated. What changes in the concentrations of 3PG and RuBP would occurimmediately? What will happen over time?