Final answer:
Nucleic acids are biological macromolecules that are assembled by linking nucleotide monomers through phosphodiester bonds.
Step-by-step explanation:
The biological macromolecule assembled by linking monomers together through phosphodiester bonds is nucleic acid. Nucleic acids, which include DNA and RNA, are vital for storing and transmitting genetic information. Monomers known as nucleotides are connected by a phosphodiester linkage, which is a covalent bond formed during a dehydration synthesis reaction between the 3' carbon atom of one nucleotide and the 5' phosphate group of the next nucleotide. This type of linkage is crucial for the formation of the long, linear chains that characterize nucleic acids.