Nucleoside

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This editable Main Article is under development and subject to a disclaimer.

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

Nucleobase  | Ribonucleoside
(RNA)  | Deoxynucleoside
(DNA)

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Purine nucleobases
Adenine
| Adenosine
A  | Deoxyadenosine

Guanine
| Guanosine
G  | Deoxyguanosine

Pyrimidine nucleobases
Thymine
| 5'-Methyluridine
m5U
(not present in RNA)  | Thymidine

Uracil
| Uridine
U  | Deoxyuridine

(not present in DNA)
Cytosine
| Cytidine
C  | Deoxycytidine

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.