Which of the following includes all of the pyrimidines found in RNA and/or DNA?
A) cytosine, uracil, and guanine
B) cytosine, uracil, and thymine
C) cytosine and uracil
D) cytosine and thymine

Question

Quizplus · Accepted Answer

Pyrimidines are a class of nucleic acids that include cytosine, uracil, and thymine. Cytosine is found in both DNA and RNA, while uracil is found only in RNA and thymine is found only in DNA. Therefore, the only option that includes all three pyrimidines found in RNA and/or DNA is B, which includes cytosine, uracil, and thymine. Option A does include cytosine and guanine, but it does not include thymine, which is found only in DNA. Option C includes only cytosine and uracil, but not thymine, and option D includes only cytosine and thymine, but not uracil.

Which of the Following Includes All of the Pyrimidines Found