Uracil is a pyrimidine base found in RNA.

Uracil is a pyrimidine base found in RNA.

• A. Thymine
• B. Adenine
• C. Cytosine
• D. Uracil

Answer: (D)

RNA contains uracil as its pyrimidine base, replacing thymine that appears in DNA. This makes uracil the base specifically associated with RNA, with adenine pairing to it in RNA strands. Thymine is the DNA pyrimidine, adenine is a purine, and cytosine is a pyrimidine found in both DNA and RNA, so they don’t match the statement as directly. Uracil’s role in RNA is what the question is testing.

RNA contains uracil as its pyrimidine base, replacing thymine that appears in DNA. This makes uracil the base specifically associated with RNA, with adenine pairing to it in RNA strands. Thymine is the DNA pyrimidine, adenine is a purine, and cytosine is a pyrimidine found in both DNA and RNA, so they don’t match the statement as directly. Uracil’s role in RNA is what the question is testing.