Which pyrimidine nitrogenous base is present exclusively in RNA and is absent from DNA molecules?
Answer and explanation
Correct answer: D. Uracil
- Step 1: DNA contains the four nitrogenous bases: adenine, guanine, cytosine, and thymine.
- Step 2: RNA contains adenine, guanine, cytosine, and uracil.
- Step 3: Uracil replaces thymine in RNA transcripts.
Answer
Uracil.
Why not the others: Thymine is found in DNA; cytosine is present in both DNA and RNA; and adenine is a purine base found in both nucleic acids.
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