Nucleoside: Difference between revisions

Revision as of 17:02, 4 December 2009

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.

@@ Line 7: / Line 7: @@
 ! Deoxynucleoside<br/>([[DNA]])
 |-
-| colspan="3" align="center"|[[Purine]] bases
+| colspan="3" align="center"|[[Purine]] nucleobases
 |- align="center" valign=""
 | [[Adenine]]<br/>
@@ Line 17: / Line 17: @@
 | [[Deoxyguanosine]]<br/>dG
 |-
-|colspan="3" align="center"|[[Pyrimidine]] bases
+|colspan="3" align="center"|[[Pyrimidine]] nucleobases
 |- align="center" valign=""
 | [[Thymine]]<br/>
-| [[5'-Methyluridine]]<br/>m<sup>5</sup>U
+| [[5'-Methyluridine]]<br/>m<sup>5</sup>U<br/>(not present in RNA)
 | [[Thymidine]]<br/>dT
 |- align="center" valign=""
 | [[Uracil]]<br/>
 | [[Uridine]]<br/>U
-| [[Deoxyuridine]]<br/>dU
+| [[Deoxyuridine]]<br/>dU<br/>(not present in DNA)
 |- align="center" valign=""
 | [[Cytosine]]<br/>
@@ Line 32: / Line 32: @@
 |-
 |}
+[[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==
 <references/>