The difference between Nucleobase and Nucleoside
When used as nouns, nucleobase means the base of a nucleic acid, such as thymine, uracil, adenine, cytosine and guanine, whereas nucleoside means 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.
check bellow for the other definitions of Nucleobase and Nucleoside
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Nucleobase as a noun (biochemistry):
The base of a nucleic acid, such as thymine, uracil, adenine, cytosine and guanine.
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Nucleoside as a 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.