The concept establishes the isomorphic mapping between the chemical properties of purine and pyrimidine nucleobases and the syntactic requirements of a linear information carrier, formally defining the nitrogenous bases adenine, guanine, cytosine, and thymine (or uracil) as distinct symbols within a four-character alphabet. This abstraction posits that the sequence of these bases constitutes the primary data structure for hereditary information, where the identity of each position is determined exclusively by the specific functional group configuration of the attached heterocyclic ring. Within the domain of molecular genetics, this serves as the foundational axiomatic framework for representing genetic code without reliance on immediate physical interactions, separating logical sequence representation from the subsequent mechanisms of replication or transcription.
Prerequisite chain context: requires DNA Structure and Heredity.