Question

During non-cyclic photophosphorylation in which of the following, $4e^{-}$ produced through photolysis will enter?

• A. PS- II
• B. PC
• C. PQ
• D. PS- I

Answer 1

Answer: (A)

PS- II

Photosystem II has P680 reaction center wherein oxygen atoms of two water molecules bind to a cluster of manganese atoms. These Mn atoms are bound to the reaction center and assocaited with an enzyme that splits water, removes electrons one at a time. These electrons fill the holes which are left in the reaction center due to released to light-energized electrons. Immediately after removal of four electrons from the two water molecules, O2 is released. Sunlight driven splitting of water is called as photolysis. Correct answer is A.