Answer:
Uracil (U)
Step-by-step explanation:
The nitrogenous bases in DNA are:
- Adenine
- Thymine
- Guanine
- Cytosine
The nitrogenous bases in RNA are:
- Adenine
- Thymine
- Guanine
- Uracil
When we compare the two lists, we see that both DNA and RNA have Adenine, Thymine, and Guanine. However, we can also notice that only RNA has Uracil. Plus, only DNA contains Cytosine.
Therefore, the nitrogenous base found in RNA, but not DNA is uracil.