Illustrated Glossary of Organic Chemistry

Nucleoside: A molecule consisting of the ribofuranose (in RNA) or 2'-deoxyribofuranose (in DNA) with a purine or pyrimidine nucleobase bonded to the anomeric carbon (the 1' carbon) of the furanose ring.

The Four DNA Nucleosides



Deoxyadenosine (A)
  
Deoxycytidine (C)




Deoxyguanosine (G)   
Deoxythymidine (T)