Which bases are pyrimidines?

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Multiple Choice

Which bases are pyrimidines?

Explanation:
Pyrimidines are bases with a single-ring structure. In DNA, the pyrimidines are cytosine and thymine. The other two bases, adenine and guanine, are purines, which have two rings. So cytosine and thymine are the pyrimidines. (In RNA, thymine is replaced by uracil, which is also a pyrimidine.)

Pyrimidines are bases with a single-ring structure. In DNA, the pyrimidines are cytosine and thymine. The other two bases, adenine and guanine, are purines, which have two rings. So cytosine and thymine are the pyrimidines. (In RNA, thymine is replaced by uracil, which is also a pyrimidine.)

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