ATP Is a Molecule Used for Energy Transport Inside the Cell

ATP is a molecule used for energy transport inside the cell. The components of ATP are a nitrogen-containing base, a pentose sugar, and three phosphate groups. Given this structure, ATP is an)

A) amino acid.
B) carbohydrate.
C) lipid.
D) nucleic acid.
E) protein. ATP is a modified adenine that has three phosphate groups, but in other aspects ATP is the same as adenine.