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Guanine
Identifiable because of two rings, NH2 and C=O

Cytosine
Identifiable because of one ring, NH2 and C=O

Adenine
Identifiable because of two rings, NH2 and no C=O

Thymine
Identifiable because of one ring,CH3 and two C=O

Uracil
Identifiable because of one ring,two C=O , NO CH3

Why is DNA more stable than RNA
Because of the abscence of an OH on the 2’ carbon