A pyrimidine found in all RNA, but not in DNA is ___.

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Study for the Biochemistry Module 6 Exam. Study with flashcards and multiple choice questions; each question includes hints and explanations. Gear up to ace your test!

Multiple Choice

A pyrimidine found in all RNA, but not in DNA is ___.

Explanation:
RNA uses a different pyrimidine than DNA: thymine is replaced by uracil. Among the pyrimidines, cytosine is found in both RNA and DNA, thymine is found only in DNA, and uracil is found in RNA but not in DNA. Therefore, the pyrimidine that appears in all RNA but not in DNA is uracil. (Guanine is a purine, not a pyrimidine, so it isn’t the correct class here.)

RNA uses a different pyrimidine than DNA: thymine is replaced by uracil. Among the pyrimidines, cytosine is found in both RNA and DNA, thymine is found only in DNA, and uracil is found in RNA but not in DNA. Therefore, the pyrimidine that appears in all RNA but not in DNA is uracil. (Guanine is a purine, not a pyrimidine, so it isn’t the correct class here.)

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