Answer:
UGCCGAAUUCAU
Explanation:
Adenine(A) pairs with Uracil(U) in RNA
and the thymine(T) in DNA pairs with adenine(A)
cytosine(C) pairs with guanine(G)
all you have to do is write the complementary letters
so, for the DNA strand
ACGGCTTAAGTA
the complementary mRNA strand is
UGCCGAAUUCAU
