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i have like ten questions for my homework
OK, it helps us help you if you also explain what about the question you don't understand. It's much easier than looking at just the question and wondering how best to explain it.
In this case, you can get some intuition about the prob from the word "pumping." Pumping requires energy. Which option on the list requires the input of energy?
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Perhaps it'd be better if your reviewed the material first, attempted the questions, and then asked the community if you have any trouble - I believe that's more of the approach OpenStudy encourages.
When you do study then you will realize that it is a kind of osmosis but directed to the transport of protons through the ATP synthase to elaborate ATP.. The reason, because protons will move following a gradient accros the membrane.