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ATP and ADP+Pi

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ATP and ADP+Pi

Postby Khan » Sun Mar 12, 2006 11:14 pm

i'm having a little confusion here. If ATP is a adenosine triphosphate group isn't that the same as ADP+Pi since thats a adenosine diphosphate and a phosphate group? i keep reading that ADP+Pi is turned into ATP but i dont understand how if they're the same thing..

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Postby kiekyon » Mon Mar 13, 2006 3:07 am

one of the phosphate tail of ATP is transferred to other compound.-->Pi
so that leave two phosphate group(ADP)
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Postby MrMistery » Mon Mar 13, 2006 6:26 pm

They are not the same thing. ATP is one compound, while ADP+Pi are 2 separate compounds. ADP+Pi don't equal ATP, just as 100 pieces of paper with writing on it don't equal a book. In order to make ATP from ADP+Pi you need to invest some energy, just as you need to invest some energy to glue the pieces of paper together to make a book. As a difference between my analogy and the biological situation, turning your book into pages will not provide energy, but turning ATP into ADP and Pi will...

Hope things are clear now
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Postby harveydobson » Mon Oct 19, 2015 6:08 am

ADP is combined with a phosphate to form ATP in the reaction ADP+Pi+free energy→ATP+H2O.
The energy released from the hydrolysis of ATP into ADP is used to perform cellular work, usually by coupling the exergonic reaction of ATP hydrolysis with endergonic reactions.
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