Which of the following bases is not used in RNA?
  1. Thymine
  2. Uracil
  3. Guanine
  4. Cytosine
  5. Adenine
Explanation
Answer: A, Thymine. RNA does not use thymine as one of its nitrogenous bases.

Key Takeaway: In DNA, the four nitrogenous bases are adenine, thymine, cytosine, and guanine. In RNA, the four nitrogenous bases are adenine, uracil, cytosine, and guanine.
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