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The base thymine appears in DNA but in RNA it is replaced by:
AUracil
BGuanine
CAdenine
DCytosine
Answer & Solution
Correct answer: A. Uracil
1. DNA carries the bases adenine, thymine, guanine and cytosine.
2. RNA carries adenine, guanine and cytosine as well, but not thymine.
3. In RNA the base T is absent and U is present instead.
4. So thymine is replaced by uracil.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 3 'Biological Macromolecules', sections 3.1-3.5_
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