According to the principles of base pairing and polarity described in the text, the tRNA anticodon binds to the mRNA codon through complementary hydrogen bonding in an antiparallel manner. The codon is 5' UAC 3'. The complementary base pairing (A-U, U-A, G-C) would result in the anticodon sequence 3' AUG 5'. When reading polynucleotide sequences by standard convention (5' to 3'), this sequence is written as 5' GUA 3'.