Which nitrogenous base is present in RNA but NOT in DNA?
Answer and explanation
Correct answer: C. Uracil
- Step 1: Nucleic acids use pyrimidine and purine nitrogenous bases to store and encode genetic information.
- Step 2: Both DNA and RNA share the purines adenine and guanine, as well as the pyrimidine cytosine.
- Step 3: In RNA, the pyrimidine uracil substitutes for thymine, base-pairing with adenine during transcription and translation.
Answer
Uracil.
Why not the others: Guanine is a purine base present in both DNA and RNA; Adenine is a purine base present in both DNA and RNA; Thymine is a pyrimidine found exclusively in DNA, replaced by uracil in RNA.
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