Which bases are pyrimidines? (Another variant)

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Multiple Choice

Which bases are pyrimidines? (Another variant)

Explanation:
Pyrimidines are one-ring nitrogenous bases. In nucleic acids, purines (adenine and guanine) have two rings, while pyrimidines have one ring and include cytosine, thymine (in DNA), and uracil (in RNA). The best choice lists uracil, thymine, and cytosine, which covers all pyrimidines across both DNA and RNA. Adenine and guanine are purines, so they don’t belong in this set. An option with two pyrimidines but missing thymine or an option with adenine and guanine would not fully represent the pyrimidine group.

Pyrimidines are one-ring nitrogenous bases. In nucleic acids, purines (adenine and guanine) have two rings, while pyrimidines have one ring and include cytosine, thymine (in DNA), and uracil (in RNA). The best choice lists uracil, thymine, and cytosine, which covers all pyrimidines across both DNA and RNA. Adenine and guanine are purines, so they don’t belong in this set. An option with two pyrimidines but missing thymine or an option with adenine and guanine would not fully represent the pyrimidine group.

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