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

  1. Anonymous (2015), Nucleoside (English). Medical Subject Headings. U.S. National Library of Medicine.