Question

why ATP is alone used in cellular respiration and why not GTP TTP CTP

Answer 1

ATP is the instant source of energy for the body. The reason why this is used in cellular respiration is that the energy utilisation for breaking the bonds in ATP for releasing the energy is comparatively very less than the GTP, TTP and CTP. So, if the latter three are used then the energy utilisation would be more to break the bonds than the release of energy. So, ATP is mostly used in the cellular respiration.