bases nucleosides nucleotides

Bases (nucleobases) are heterocyclic purine and pyrimidine analogues found in DNA and RNA.

Nucleosides comprise the RNA bases bound to a ribose sugar molecule -- examples are cytidine, uridine, adenosine, guanosine, thymidine and inosine. Deoxyribonucleosides comprise bases bound to a molecule of the sugar deoxyribose.

Nucleotides are nucleosides attached to a phosphate (phosphorylated by specific kinases), and deoxynucleotides are phosphorylated deoxyribonucleosides.

adenineAMPATPcAMPcytosineC to TC to UguaninethymidineT U mismatchuracil

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