The biological incorporation of purines and pyrimidines into nucleosides and nucleic acid.
D009696:Nucleic Acids; D009705:Nucleosides; D011687:Purines; D011743:Pyrimidines
D009696:Nucleic Acids; D009705:Nucleosides; D011687:Purines; D011743:Pyrimidines; C030985:purine
NUCLEIC ACIDS; PURINE AND BASES; PYRIMIDINES