The following sentences (from 
to 
) are the main steps of chemosynthetic ATP synthesis in the light reaction. Which answer places them in correct order?
P. 
concentration gradient is generated
Q. 
diffuses through ATP synthtase
R. Carriers use energy from electrons to move 
across the membrane
S. Electrons from PS-II pass along electron transport chain
T. Light excites electrons in PS-II
U. Energy of 
flow is used by ATP synthase to make ATP
Text Solution
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In the light reaction, the following are the main steps in chemosynthetic ATP synthesis: Light stimulates electrons in PS-II; electrons from PS II transit down the electron transport chain; carriers use energy from electrons to carry 
across the membrane; 
concentration gradient forms; 
diffuses via ATP synthetase; ATP synthase uses energy from 
flow to synthesise ATP.
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