The basic molecular assembly making up
DNA and
RNA. Each nucleotide is comprised of a "backbone" part containing a phosphate group, and a sugar molecule (deoxyribos in DNA, ribose in RNA), along with one of the bases (ATCG, and U) which are used to store encoded instruction sequences.
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Nucleosides
Nucleo
sides are essentially nucleotides that do not have any phosphate groups in their configuration.