Cyclic Electron Transport Flashcards Preview

Bio 4U- Unit 2: Photosynthesis > Cyclic Electron Transport > Flashcards

Flashcards in Cyclic Electron Transport Deck (3)
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Photosystem I can function independently of PS II

Electron transport from PS I to ferredoxin (Fd) is not followed by electron donation of NADP+ reductase
Instead, reduced Fd donates electrons back to PQ
PQ continually reduced and oxidized and moves protons across thylakoid membrane without involvement of PS II


Net Result

energy absorbed converted into chemical energy for ATP without oxidation of water or reduction of NADP+ to NADPH


Important roles

- reduction of carbon dioxide in Calvin cycle requires more ATP than NADPH, additional ATP provided by cyclic ETC

- energy-requiring rxn in chloroplast dependant on ATP from cyclic ETC