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/ˈn(j)u(ː)kliəˌsaɪd/ · noun
(biochemistry) an organic molecule in which a nitrogenous heterocyclic base (or 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..
Use nucleoside when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Nucleoside means (biochemistry) an organic molecule in which a nitrogenous heterocyclic base (or 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..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use nucleoside where its definition matches the intended context.
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