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    Please could somebody explain where the four phosphors come from in glycolysis? I get that two come (one each) from the triose phosphate when NAD is reduced, but where do the other two come from (to get a net of two ATP produced overall)?
    Thanks!
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    Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.
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    (Original post by SpohieAlice)
    Please could somebody explain where the four phosphors come from in glycolysis? I get that two come (one each) from the triose phosphate when NAD is reduced, but where do the other two come from (to get a net of two ATP produced overall)?
    Thanks!
    Did you get any response to this because i am confused on exactly the same thing and can't find help anywhere?
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    I am guessing you are doing A-level biology (like me) and the content we learn misses a few steps. I looked your question up and this diagram seems to explain it: http://biology-themiracleoflife.blog...lycolysis.html
    Looks like each triose phosphate has Pi added before two molecules of ADP are phosphorylated.
    I think this is beyond the scope of A-level.
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    It took a while, but I think eventually I found that they just come from elsewhere in the cell generally; there wasn't a particular step that generated them. It's not the most satisfying answer. You could try Khan academy, I think I remember it being pretty good. Sorry I can't answer better, it's been a while. Good luck, it's pretty hard to find info on this stuff!
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    It comes from other parts of respiration like the krebs cycle or oxidative phosphorylation.
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