Among the nitrogenous base involved in DNA and RNA formation, which is the double ring base?

Uracil

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Guanine

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Thymine

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Cytosine

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Solution

The correct option is D Guanine
Guanine is one of the four main nucleobases found in the nucleic acids DNA and RNA. In DNA, guanine is paired with cytosine. With the formula C5H5N5O, guanine is a derivative of purine, consisting of a fused pyrimidine-imidazole ring system with conjugated double bonds. Being saturated, the bicyclic molecule is planar. The guanine nucleoside is called guanosine.

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