The chemical reactions and pathways resulting in the formation of a macromolecule, any molecule of high relative molecular mass, the structure of which essentially comprises the multiple repetition of units derived, actually or conceptually, from molecules of low relative molecular mass. [ GOC:mah ]
Synonyms: macromolecule anabolism biopolymer biosynthetic process macromolecule biosynthesis macromolecule synthesis macromolecule formation