Answer: ADP is a short form for adenosine diphosphate.
Explanation: Adenosine diphosphate is a nucleotide having three constituents: Adenine, a ribose sugar and two phosphate groups. ADP takes part in cellular reactions involving production of ATP. When an additional phosphate group is added to adenosine diphosphate (ADP), adenosine triphosphate (ATP) is formed. ATP is a usable form of energy within the cell. ATP is an energy-rich compound found in the cells.