Question

three types of rna
the presence of uracil instead of thymine distinguishes rna from dna. uracil forms base pairs with adenine in mrna. the structure helps distinguish rna from dna molecules.
which base in mrna forms a base pair with adenine?
guanine
uracil
cytosine

Explanation:

DNA has thymine which pairs with adenine. RNA replaces thymine with uracil. So in mRNA (a type of RNA), uracil forms a base - pair with adenine.

Answer:

uracil