<Tr> <Td> Uracil </Td> <Td> Uridine U </Td> <Td> Deoxyuridine dU </Td> </Tr> <Tr> <Td> Cytosine </Td> <Td> Cytidine </Td> <Td> Deoxycytidine dC </Td> </Tr> <P> Nucleosides are glycosylamines that can be thought of as nucleotides without a phosphate group . A nucleoside consists simply of a nucleobase (also termed a nitrogenous base) and a five - carbon sugar (either ribose or deoxyribose), whereas a nucleotide is composed of a nucleobase, a five - carbon sugar, and one or more phosphate groups . In a nucleoside, the base is bound to either ribose or deoxyribose via a beta - glycosidic linkage . Examples of nucleosides include cytidine, uridine, adenosine, guanosine, thymidine and inosine . </P> <P> While a nucleoside is a nucleobase linked to a sugar, a nucleotide is composed of a nucleoside and one or more phosphate groups . Thus, nucleosides can be phosphorylated by specific kinases in the cell on the sugar's primary alcohol group (- CH - OH) to produce nucleotides . Nucleotides are the molecular building - blocks of DNA and RNA . </P>

What's the difference between a nucleotide and a nucleoside
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