If DNA has the code ATGC, what is the complementary code in mRNA?

The complementary code for mRNA would be UACG.

Explanation:

DNA pairing has the following pairs: A-T and C-G

RNA pairing has the following pairs: A-U and C-G.

In this case, we would use the RNA pairing rules and find the complementary pairs for the DNA sequence. So the A will pair with U, T will pair with A, G will pair with C, and C will pair with G, giving the complementary mRNA code as UACG.

A-T T-A G-C C-G that will be yoir anwser