<P> The final product of PSII is plastoquinol , a mobile electron carrier in the membrane . Plastoquinol transfers the electron from PSII to the proton pump , cytochrome b6f . The ultimate electron donor of PSII is water . Cytochrome b6f proceeds the electron chain to PSI through plastocyanin molecules . PSI is able to continue the electron transfer in two different ways . It can transfer the electrons either to plastoquinol again , creating a cyclic electron flow , or to an enzyme called FNR ( Ferredoxin -- NADP ( + ) reductase ) , creating a non-cyclic electron flow . PSI releases FNR into the stroma , where it reduces NADP + to NADPH . </P>
<P> The final product of PSII is plastoquinol , a mobile electron carrier in the membrane . Plastoquinol transfers the electron from PSII to the proton pump , cytochrome b6f . The ultimate electron donor of PSII is water . Cytochrome b6f proceeds the electron chain to PSI through plastocyanin molecules . PSI is able to continue the electron transfer in two different ways . It can transfer the electrons either to plastoquinol again , creating a cyclic electron flow , or to an enzyme called FNR ( Ferredoxin -- NADP ( + ) reductase ) , creating a non-cyclic electron flow . PSI releases FNR into the stroma , where it reduces NADP + to NADPH . </P>
photosystem that accepts electrons to make nadph from nadp +
photosystem that accepts electrons to make nadph from nadp +
PSI
PSI