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What's the point of ATP synthesis from ADP + P?

  1. Feb 23, 2013 #1
    Wouldn't you need an ATP to actually add the P to ADP?

    ...So then nothing would really be accomplished because you'd have to use an ATP to make a different ATP.

    Or is there a different type of energy that can add P to ADP?

    My book says that the ADP + P reaction uses energy from catabolism (energy-releasing processes)...
    So what other type of enery makes ADP join with P?

    ...And now that I think of it, it doesn't really make sense that an ADP + P reaction could use ATP because then ADP would already be phosphorylated... and wouldn't need that P reactant.

    Thanks for the help! :)
  2. jcsd
  3. Feb 23, 2013 #2
    Which part of synthesis are you referring to, glycolysis?

    Edit: Simply stated, glycolysis takes 2 ATP's and produces 4 ATP's.

    How P gets added to ADP to make ATP:
    Glycolysis- Enzymes (hexokinase,phosphofructokinase, ect) also play a role in binding phosphates to ADP.

    Citric Acid Cycle- GTP is used to generate ATP in the

    Oxidative Phosphorylation- Chemiosmosis step uses the ATP synthase (enzyme site)
    Last edited: Feb 23, 2013
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