The triose phosphates 3-phosphoglycerate and dihydroxyacetone phosphate, generat
ID: 49856 • Letter: T
Question
The triose phosphates 3-phosphoglycerate and dihydroxyacetone phosphate, generated in the Calvin cycle, can be stored as starch (in the chioroplasts) or sucrose (in nonphotosynthetic plant parts). However, the conversion of triose phosphates to starch and/or sucrose must be balanced against the need for triose phosphates in the Calvin cycle. Complete parts (a), (b), (e), and (d). Which of the following is associated with light and dark? Light Dark (a) increased p1concentration increased triose phosphateconcentration photosynthesis Fructose 2,6-bisphosphate (F26BP) concentration is regulated by the concentrations of triose phosphates and ATP. When PFK-2 activity increases, F26BP concentration increases. When FBPase-2 activity is stimulated, fructose 6-phosphate (the more direct sucrose precursor) concentration increases. Which of the following stimulates PFK-2, and therefore increases F26BP concentration? (b) increased triose phosphate concentration increased Pi concentrationExplanation / Answer
answer 1. --- increased Pi concentartion in the light .
photosynthesis ---- dark reaction in the dark and light reaction or hill reaction takes place in light.
increase triose phosphate concentration in dark.
answer 2--- increased Pi concentarion.
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