Answer:
Uracil
Explanation:
The nucleotide bases in DNA are adenine - thymine, cytosine - guanine. (ATCG)
The nucleotide bases in RNA are adenine - uracil, cytosine - guanine.
(AUCG)
Answer: Thymine
Adenine always goes with Thymine and cytosine with guanine. Another way you can remember it it apple to tree and car to garage.
