The following (P through U) are the main steps of chemosynthetic ATP synthesis in the light reaction. Which answer places them in correct order?

P. H+ concentration gradient established

Q. H+ diffuses through ATP synthase

R. Carriers use energy from electrons to move H+ across the membrane

S. Electrons from PSII pass along electron transport chain

T. Light excites in PSII

U. Energy of H+ flow is used by ATP synthase

P Q T S R U

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S T P Q R U

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T S R P Q U

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T S R U Q P

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Solution

The correct option is C $T S R P Q U$
The correct order of chemosynthetic ATP synthesis in the light reaction are:

T- Light excites electron in PS II
S- Electron from PS II pass along electron transport chain
R- Carriers use energy from electron to move $H^{+}$ across the membrane
P- $H^{+}$ concentration gradient established
Q- $H^{+}$ diffuse through ATP synthase
U- Energy of $H^{+}$ flow is used by ATP synthase to make ATP

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