Answer:
Uracil (U) is found in RNA only. Thymine (T) is found in DNA only.
Explanation:
DNA has the nitrogenous bases adenine (A), thymine (T), guanine (G), and cytosine (C). On the other hand, RNA has the nitrogenous bases adenine (A), uracil (U), guanine (G), and cytosine (C).
Thus, only RNA has uracil (U) and only DNA has thymine (T).
