A disruption of the cell cycle can occur during Gap 1 (G1 phase). At this phase, a cell may be prevented from synthesizing necessary proteins. The failure to
synthesize the proteins typically cause a

The correct answer for the blank is ADP ( adenosine diphosphate).

ATP is the energy currency of the cell. It stores energy in its high energy phosphoanhydride bond, which are present between phosphate. During ATP hydrolysis, the high energy bond is broken down and the large amount of stored energy is liberated. Therefore, ATP loses a phosphate and gets converted into ADP and inorganic phosphate.

Thus, ADP is formed when ATP loses a phosphate.