A class of nucleotides that includes adenine and guanine.

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Multiple Choice

A class of nucleotides that includes adenine and guanine.

Explanation:
Purines are a class of nitrogenous bases with a two-ring structure, and adenine and guanine belong to this group. This two-ring arrangement sets purines apart from pyrimidines, which have a single ring and include cytosine, thymine, and uracil. In a nucleotide, the base is one of these two families, distinguishing purines from pyrimidines. Nucleosides are just a sugar attached to a base (no phosphate), and monomer is a broader term not specific to the base class. So, the class that includes adenine and guanine is purines.

Purines are a class of nitrogenous bases with a two-ring structure, and adenine and guanine belong to this group. This two-ring arrangement sets purines apart from pyrimidines, which have a single ring and include cytosine, thymine, and uracil. In a nucleotide, the base is one of these two families, distinguishing purines from pyrimidines. Nucleosides are just a sugar attached to a base (no phosphate), and monomer is a broader term not specific to the base class. So, the class that includes adenine and guanine is purines.

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