What product of the preparatory phase of glycolysis is required in the payoff phase, but at twice the concentration?

ADP - Adenosine diphosphate, morevoer known as adenosine pyrophosphate, is an vital natural compound in metabolism and is fundamental to the stream of energy in living cells. ADP comprises of 3 critical auxiliary components : a sugar spine connected to adenine and two phosphate fortified to the 5 carbon atom of ribose.