ATP / ADP

A high ratio of ATP/ADP is maintained to drive energy-requiring processes
Hardie et al. 2012 Nat Rev Mol Cell Biol 13(4): 251-262

Adenylate kinase catalyzes (2ADP ↔ ATP + AMP) that is usually maintained close to equilibrium
Hardie et al. 2012 Nat Rev Mol Cell Biol 13(4): 251-262

Cells require energy by the hydrolysis of ATP back to ADP and phosphate, thus “discharging the battery”
Hardie et al. 2012 Nat Rev Mol Cell Biol 13(4): 251-262

Every living cell contains a “rechargeable battery” formed by pairs of the reaction ATP ↔ ADP + phosphate
Hardie et al. 2012 Nat Rev Mol Cell Biol 13(4):…