Yuqorida keltirilgan purin va pirimidin asoslarida qо‘sh bog‘lar va - ON, -NH2
guruhlari bо‘lib, ular asoslarni har xil tautimer holatiga: oksihosilalari laktam-
laktim va aminohosilalari esa amin-imin kо‘rinishga sababchi bо‘lishlari mumkin.
4-rasm. Nukleotidlar. Purin va Pirimidin asoslari tuzilishi.
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