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    Did I get these steps COMPLETELY right?:
    1) Particles of light called photons hit chlorophyll p680 in PSII at around 680nm.The chloropyll transfer the energy associated with the light to a pair of electrons, which become excited at a higher energy level

    2) The electrons leave PSII and are captured by an electron accepter , and move along electron carriers

    3) to replace electrons lost as PSII photolysis of water occurs where light splits water into protons, electrons and oxygen

    4) the electrons that are moving along the electron carriers lose energy, which is used to pump protons across thylakoid membrane and into thylakoid space.

    5) there an accumulation of electrons in the thylakoid space, potential energy and a proton gradient between thylakoid space and stroma build up

    6) This causes chemiosmosis where protons diffuse through ATP synthase enzymes to stroma. This cause a proton motive force which rotates parts of ATP synthase enzymes (rotor and stalk) which cause ADP to join to a phosphate

    7) Photons hit chlrophyll p700 in PS1 and a pair of electrons are lost

    8) These electrons and protons in stroma join NADP to form NADPH



    Is this correct?

    Tanx for your time
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    (Original post by Biologyquestions)
    Did I get these steps COMPLETELY right?:
    1) Particles of light called photons hit chlorophyll p680 in PSII at around 680nm.The chloropyll transfer the energy associated with the light to a pair of electrons, which become excited at a higher energy level

    2) The electrons leave PSII and are captured by an electron accepter , and move along electron carriers

    3) to replace electrons lost as PSII photolysis of water occurs where light splits water into protons, electrons and oxygen

    4) the electrons that are moving along the electron carriers lose energy, which is used to pump protons across thylakoid membrane and into thylakoid space.

    5) there an accumulation of electrons in the thylakoid space, potential energy and a proton gradient between thylakoid space and stroma build up

    6) This causes chemiosmosis where protons diffuse through ATP synthase enzymes to stroma. This cause a proton motive force which rotates parts of ATP synthase enzymes (rotor and stalk) which cause ADP to join to a phosphate

    7) Photons hit chlrophyll p700 in PS1 and a pair of electrons are lost

    8) These electrons and protons in stroma join NADP to form NADPH



    Is this correct?

    Tanx for your time
    There is not an accumulation of electrons in the thylakoid space, there is an accumulation of protons.The proton motive force is what results from the concentration difference in protons, it isn't caused by the movement of protons through ATP synthase. Technically the flow of protons through the ATP synthase complex doesn't cause ATP to join Pi, it releases tightly bound ATP, but I don't think that matters too much, what you've said for A level is fine. Everything else seems fine.
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    (Original post by benandjerry)
    There is not an accumulation of electrons in the thylakoid space, there is an accumulation of protons.The proton motive force is what results from the concentration difference in protons, it isn't caused by the movement of protons through ATP synthase. Technically the flow of protons through the ATP synthase complex doesn't cause ATP to join Pi, it releases tightly bound ATP, but I don't think that matters too much, what you've said for A level is fine. Everything else seems fine.
    tanx
 
 
 
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