Answer
Light reaction occurs in photosynthetic
membrane of bacteria.
-In present of light, bacteriochorophyll absorbs light energy.
-Energy absorbed is then channelled to reaction centre.
-Reaction centre becomes photoactivated and photosystem I becomes
photoactivated.
-Electron of reaction centre becomes excited and escape.
Escaped electrons are then
transferred through a series of electron carriers and finally
back to reaction centre.
-As electron carriers transfer electron down the energy level, energy
released. Released
energy is used for
photophosphorylation of ADP to ATP.
-In purple bacteria, hydrogen sulphide is splitted into electrons,
sulphur and hydrogen
ion. Reverse electron
flow to oxidised NADP produces NADPH.
-Dark reaction is similar to plants except the process occurs in the
cytoplasm of
bacteria.
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