Refer to the Table Below Containing Data Collected from Experiments

question 142

Essay

Refer to the table below containing data collected from experiments using chloroplasts isolated from leaves taken from living spinach plants.In the experiments, measurements were taken of the catalytic activity of the enzyme sedoheptulose bisphosphatase (SBP), which operates in the part of the Calvin cycle that regenerates ribulose 1,5-bisphosphate (RuBP).The chloroplasts were broken open using a blender, and the resulting mixture was centrifuged and the pellet discarded.The enzyme SBP was present in the supernatant and could be assayed by adding its substrates and measuring how much product was formed from the reaction it catalyzed.Depending on additional treatments listed in the table, the catalytic activity of SBP varied as shown. What do the data suggest about the role of ferredoxin and thioredoxin in the function of this enzyme? Explain your reasoning.

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