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Nucleoside

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In biology, nucleosides are "purine or pyrimidine bases attached to a ribose or deoxyribose."[1]

Nucleobase Ribonucleoside
(RNA) 		Deoxynucleoside
(DNA)
Purine nucleobases
Adenine
 Adenosine
A 		Deoxyadenosine
dA
Guanine
 Guanosine
G 		Deoxyguanosine
dG
Pyrimidine nucleobases
Thymine
 5'-Methyluridine
m5U
(not present in RNA) 		Thymidine
dT
Uracil
 Uridine
U 		Deoxyuridine
dU
(not present in DNA)
Cytosine
 Cytidine
C 		Deoxycytidine
dC

Purine or pyrimidine bases (nucleobases) attached to ribose are called ribonucleosides.

Purine or pyrimidine bases (nucleobases) attached to deoxyribose are called deoxynucleosides.

A nucleotide is a nucleoside (a purine or pyrimidine base plus a pentose sugar) with a phosphate group added.

References[edit]

  1. ↑ Anonymous (2025), Nucleoside (English). Medical Subject Headings. U.S. National Library of Medicine.
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