Which pyrimidine base is found in RNA?
Correct answer: B. Uracil
- A. Thymine
- B. Uracil
- C. Cytosine
- D. Guanine
Explanation
Uracil is the correct answer as it is the pyrimidine base that is unique to RNA. In RNA, uracil pairs with adenine, replacing thymine, which is used in DNA. While cytosine is also a pyrimidine, it is present in both RNA and DNA, thus not making it unique to RNA. Guanine is a purine base, not a pyrimidine, which rules it out as an option. Thymine is only found in DNA, not RNA.
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