Cyclic vs. Non-cyclic Electron Flow

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Description and Tags

Differences in flow in Light-dependent Reactions

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Non-Cyclic Flow

Light dependent reaction procedes as normal

Produces:

  • ATP

  • NADPH

  • O2

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Cyclic flow

Electrons in PSI move to:

  • Ferredoxin > Cytochrome b6f > back to PSI

    • Sole purpose is to pump protins to Lumen

    • Creates proton gradient

  • Only peoduces ATP

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Importance

There is a difference in need between NADPH and ATP

  • 9:6 ratio for them in Calvin cycle

    • More ATP is requires than NADPH

    • If on,y Non-cyclic flow occured, an over-abundance of NADPH would be created

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