During photosynthesis, Photosystem II gives electrons to the electron transport chain in order to provide the Calvin Cycle with __________, while Photosystem I gives electrons to __________ that will also be used by the Calvin Cycle. rubisco; P680 ATP; NADPH oxygen; ATP chlorophyll; ATP synthase
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These molecules are then used by the Calvin Cycle to produce glucose. Photosystem I provides electrons to NADP+ to form NADPH, which is also used by the Calvin Cycle. Show more…
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In both photosystem I and photosystem II, light energy is used to excite electrons. To the confusion of many students, the two photosystems were named in the order of their discovery, not in the order of their work in the light-dependent reactions. Photosystem II comes first in the sequence of events that moves electrons from water molecules to their destination, NADP+. Hydrogen ions travel with the electrons and they change NADP+ into NADPH. The process is summarized in this diagram: 2H+ NADP NADPH To Light-Independent Reactions Light Light STROMA ATP Thylakoid membrane Electron carriers ATP synthase To Light-Independent Reactions Photosystem I Photosystem II 2 H2O 4 H+ THYLAKOID SPACE
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In both photosystem I and photosystem II, light energy is used to excite electrons. To the confusion of many students, the two photosystems were named in the order of their discovery, not in the order of their work in the light-dependent reactions. Photosystem II comes first in the sequence of events that moves electrons from water molecules to their destination, NADP+. Hydrogen ions travel with the electrons and they change NADP+ into NADPH. The process is summarized in this diagram: 2H+ + 2 NADP+ + 4e- -> 2 NADPH To Light-Independent Reactions Light Light STROMA H+ H+ H+ H+ Electron carriers Thylakoid membrane Photosystem I Photosystem II ATP synthase ADP + P ATP To Light-Independent Reactions 4e- H+ H+ 2 H2O -> 4H+ + O2 H+ H+ THYLAKOID SPACE
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