Adenosine monophosphate is a water-soluble nucleotide which is vital to the continued existence of life. AMP is formed when ADP relinquishes a phosphate group to become adenosine monophosphate (AMP) giving out 30.5 kJmol-1 to provide energy for cellular biochemical reactions. AMP itself can lose its final phosphate group giving out 14 kJmol-1 of energy. During respiration, AMP is phosphorylated to ADP and ADP to ATP.