Which monomer is associated with the structure of DNA and RNA?

The monomer associated with the structure of DNA and RNA is nucleotides. Nucleotides consist of three components: a phosphate group, a five-carbon sugar (ribose in RNA and deoxyribose in DNA), and a nitrogenous base (adenine, thymine, cytosine, and guanine in DNA; adenine, uracil, cytosine, and guanine in RNA). These nucleotides link together through phosphodiester bonds to form the long strands of nucleic acid.

The sequence of these nucleotides encodes genetic information, and their specific arrangements determine the structure and function of the nucleic acids. Thus, without nucleotides, the essential structures of DNA and RNA would not exist or function properly in biological processes like replication and protein synthesis.