Nucleoside meaning

no͝oklē-ə-sīd, nyo͝o-
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Any of various compounds consisting of a sugar, usually ribose or deoxyribose, and a purine or pyrimidine base, especially a compound obtained by hydrolysis of a nucleic acid, such as adenosine or guanine.
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Any of various compounds consisting of a purine or pyrimidine base linked to a carbohydrate: a major component of a nucleotide.
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Any of various compounds, such as adenosine or guanosine, that consist of a sugar, usually ribose or deoxyribose, linked to a purine or pyrimidine base. Nucleosides are constituents of the nucleotides that make up nucleic acids.
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Any of various compounds consisting of a sugar, usually ribose or deoxyribose, and a nitrogen base (a purine or pyrimidine). Nucleosides are constituents of the nucleotides of nucleic acids. Adenosine and thymidine are nucleosides.
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(biochemistry) An organic molecule in which a nitrogenous heterocyclic base (nucleobase), which can be either a double-ringed purine or a single-ringed pyrimidine, is covalently attached to a five-carbon pentose sugar (deoxyribose in DNA or ribose in RNA). When the phosphate group is covalently attached to the pentose sugar, it forms a nucleotide.
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