Within the thylakoid membranes of the chloroplast. are
 

two photosystems Photosystem I optimally absorbs
 

photons of a wavelength of 700 nm Photosystem II
 

optimally absorbs photons of a wavelength of 680 nm.
 

The numbers indicate the order in which the
 

photosystems were discovered, not the order of electron
 

transfer tinder normal conditions electrons flow from
 

PSÍI through cytochrome bf(a membrane bound
 

protein analogous to Complex III of the mitochondrial
 

electron transport chain) to PSI.
 

Photosystem II uses light energy to oxidize two
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