What are the base pairs between mRNA and tRNA?

The anticodon of tRNA fits to the codon of mRNA. ( codons are three bases that code for one amino acid. Like this. ( remember. Uracil instead of thymine in RNA ) Anti codon on top; codon on the bottom.

ACGUUCCAG

UGCAAGGUC

These represent three codon triplets as they would come into the ribosome, gave tRNA come in on top to match them and the tRNA would bring one appropriate aminao acid to add to the growing polypeptide.