RNA is composed of all of the following bases EXCEPT:
  1. Adenine
  2. Guanine
  3. Cytosine
  4. Thymine
  5. Uracil
Explanation
Answer: D, Thymine. Thymine is used as a nitrogenous base in DNA, but not RNA.

Key Takeaway: Both DNA and RNA use adenine, guanine, and cytosine as bases. However, DNA uses thymine as its fourth base, and RNA uses uracil as its fourth base.

Photo: T7 RNA Polymerase, Tim Vickers
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