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Nucleotídeos

Pentose + Base nitrogenada + Grupo fosfato.

Bases púricas ou purinas

Adenina e Guanina. Possuem duas cadeias fechadas.

Bases pirimídicas ou pirimidinas

Citosina, Timina e Uracila. Possuem uma cadeia fechada.

Adenina + Timina

Ligação dupla.

Citosina e Guanina

Ligação tripla.

Em relação a estrutura da pentose, a desoxirribose e a ribose se diferenciam...

...pela presença do grupo hidroxila no carbono 2 do anel.