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From the link given by @Kendall Such a gradient can be maintained because the thylakoid membrane is essentially impermeable to protons. I think this solves your dilemma of 'why not maintaining equilibrium' totally. The reason for this difference is that the thylakoid membrane is quite permeable to Cl- and Mg2+. The light-induced transfer of H+ ...


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I think we can look at it like this Your noncyclic pathway liberates 4H+ from two water molecules. We're doing that because to get one O2, you've got to split 2H2O. This happens in photosystem II. So in the next step (you know, really broadly) the electrons are passed to cytochrome b6-f complex, where each electron allows it to pump 2H+ into the thylakoid ...


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Sorry for the poor quality of the image, but its just as a reference for my answer. You have made the question too complex. From the figure, we find that 1 H2O gives 2 H+ and 2 e-. 2 e-, through quinone cycle, provide 4 H+ i.e. total 6 H+ which form 6/3 = 2 ATP i.e. 1 H2O => 6 H+ => 2 ATP Multiply this equation by 8 and you get: 8 H2O => 48 H+ => 16 ...


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As far as I can understand your question, you wish to know why a plant cell consumes ATP to produce glucose when it can directly use the ATP as an energy molecule. ATP is an energy currency and is required in different biochemical pathways. However, it is not a good energy storage molecule. Following are the reasons why production of an energy molecule ...



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