What term describes a double-ring nitrogenous base?

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Multiple Choice

What term describes a double-ring nitrogenous base?

Explanation:
Purine describes a nitrogenous base with two rings. Adenine and guanine are classic examples, featuring a fused two-ring system. This distinguishes them from pyrimidines, which are single-ring bases like cytosine, thymine, and uracil. A nucleoside is a base attached to a sugar, and “base” is a general term for the nitrogen-containing component; neither naming reflects the two-ring structure. So the term for a double-ring nitrogenous base is purine.

Purine describes a nitrogenous base with two rings. Adenine and guanine are classic examples, featuring a fused two-ring system. This distinguishes them from pyrimidines, which are single-ring bases like cytosine, thymine, and uracil. A nucleoside is a base attached to a sugar, and “base” is a general term for the nitrogen-containing component; neither naming reflects the two-ring structure. So the term for a double-ring nitrogenous base is purine.

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