Nucleobase
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| Nucleobase | Nucleoside |
|---|---|
| Missing image Adenine_chemical_structure.png Chemical structure of adenine Adenine | Missing image A_chemical_structure.png Chemical structure of adenosine Adenosine A |
| Missing image Guanine_chemical_structure.png Chemical structure of guanine Guanine | Missing image G_chemical_structure.png Chemical structure of guanosine Guanosine G |
| Missing image Thymine_chemical_structure.png Chemical structure of thymine Thymine | Missing image T_chemical_structure.png Chemical structure of thymidine Thymidine T |
| Missing image Uracil_chemical_structure.png Chemical structure of uracil Uracil | Missing image U_chemical_structure.png Chemical structure of uridine Uridine U |
| Missing image Cytosine_chemical_structure.png Chemical structure of cytosine Cytosine | Missing image C_chemical_structure.png Chemical structure of cytidine Cytidine C |
Nucleobases are the parts of RNA and DNA that are involved in pairing up (see also base pairs). These include cytosine, guanine, adenine, thymine (DNA) and uracil (RNA). These are abbreviated as C, G, A, T, and U, respectively.
Uracil replaces thymine in RNA. These two bases are identical except that uracil lacks the 5' methyl group. Adenine and guanine belong to the double-ringed class of molecules called purines (abbreviated as R). Cytosine, thymine, and uracil are all pyrimidines (abbreviated as Y).
A nucleobase covalently bound to the 1' carbon of a ribose or deoxyribose is called a nucleoside, and a nucleoside with one or more phosphate groups attached at the 5' carbon is called a nucleotide.
See also
Template:Nucleic acidseo:Nitrogena bazo es:base nitrogenada
Categories: DNA | RNA