Final answer:
Adenosine triphosphate (ATP) serves as an energy carrier, a phosphate donor, an allosteric regulator, and a precursor of cAMP and RNA. Hence, e) is correct.
Step-by-step explanation:
Adenosine triphosphate (ATP) serves as an energy carrier, a phosphate donor, an allosteric regulator, and a precursor of cAMP and RNA. ATP is the primary energy-supplying molecule for living cells and stores energy for use by body cells.
It is made up of a nucleotide, a five-carbon sugar, and three phosphate groups. ATP provides energy for cellular work by donating its phosphate group to another molecule via phosphorylation.