nucleoside definition

  • noun:
    • Any of various substances composed of a sugar, frequently ribose or deoxyribose, and a purine or pyrimidine base, particularly a compound gotten by hydrolysis of a nucleic acid, including adenosine or guanine.
    • a natural molecule by which a nitrogenous heterocyclic base (or nucleobase), that can easily be either a double-ringed purine or a single-ringed pyrimidine, is covalently attached with a five-carbon pentose sugar (deoxyribose in DNA or ribose in RNA). When the phosphate team is covalently connected to the pentose sugar, it forms a nucleotide.
    • a form of molecule within all residing organisms, current mainly in chemically combined form as a factor of nucleic acids, also in lower amounts in free-form, composed of a pentose sugar bound to a purine or pyrimidine base; two types of nucleoside, ribonucleoside and deoxyribonucleoside, exist. The most common bases present in nucleosides are adenine, cytosine, uracil, guanine, and thymine, and a lesser extent hypoxanthine and other bases are observed. Probably the most commmon ribonucleosides composed from all of these bases are called adenosine, cytidine, uridine, and guanosine. The forms esterified with orthophosphoric in the 5-position regarding the pentose are called nucleotides. The nucleotides form the monomer devices which are combined into DNA and RNA, which carry the hereditary information needed for reproduction in every understood organisms.
    • a glycoside created by limited hydrolysis of a nucleic acid

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