Answer to Question #174917 in General Chemistry for Adnan Hussain

Question

Why ATP is the currency of energy  

But why not GTP ,and CTP and  TTP currency of energy

Answer 1

ATP is an excellent energy storage molecule to use as "currency" due to the phosphate groups that link through phosphodiester bonds. Relevant to separate ATP and GTP, which are both purines, from UTP, CTP, and TTP which are pyrimidines. ATP was random or was just thermodynamically the most favorable, but I can shed light on where other nucleotides are used in metabolism.