What name is given to nitrogen bases that have a single-ring structure?

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Multiple Choice

What name is given to nitrogen bases that have a single-ring structure?

Explanation:
Single-ring nitrogen bases are called pyrimidines. This group includes cytosine, thymine (in DNA), and uracil (in RNA). The reason this matters is that purines, the other class of bases, have two rings. In nucleic acids, base pairing typically occurs between one purine and one pyrimidine, which helps keep the DNA/RNA double helix’s width uniform (A pairs with T or U, and G pairs with C). The standard term is pyrimidines; the spelling “Pyramidenes” is not the conventional term. The other options don’t describe a base class: purines are the two-ring bases, nucleotides are the base–sugar–phosphate units, and ribose is the five-carbon sugar component in RNA.

Single-ring nitrogen bases are called pyrimidines. This group includes cytosine, thymine (in DNA), and uracil (in RNA). The reason this matters is that purines, the other class of bases, have two rings. In nucleic acids, base pairing typically occurs between one purine and one pyrimidine, which helps keep the DNA/RNA double helix’s width uniform (A pairs with T or U, and G pairs with C). The standard term is pyrimidines; the spelling “Pyramidenes” is not the conventional term. The other options don’t describe a base class: purines are the two-ring bases, nucleotides are the base–sugar–phosphate units, and ribose is the five-carbon sugar component in RNA.

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