Where does the ADP come from? As in before ADP was made from ATP and visa-versa how is it conceived that they appeared in nature?
closed as unclear what you're asking by mgkrebbs, David, The Last Word, Roland, Bryan Krause♦ Sep 4 '18 at 17:25
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Adenosine diphosphate is a nucleotide, specifically a purine nucleotide, since it contains a double ring. These nucleotides are synthesized by cells from amino acids and other nutrients in a rather long and complicated biochemical pathway. You can find information about this pathway in any biochemical textbook, or see this page in Wikipedia.