The energy of the photon absorbed by chlorophyll is coupled to electron transport.
oxidation of substrates initially generates NADH which is recycled to NAD by the electron transport chain (ETC) in the inner mitochondrial membrane.
The purple bacteria evolved oxygen respiration by reversing the flow of molecules through their carbon fixing pathways and modifying their electron transport chains.
It has also been shown to disrupt the normal function of the electron transport chain within mitochondria.
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