A tRNA molecule has the anticodon 5^{\prime} AAG 3^{\prime}. With which mRNA codon will this anticodon interact?
The interaction between a codon and an anticodon has directionality (antiparallel) considerations, that is,
The given anticodon, with reversed directionality, is
and its codon interaction, which involves complementary base pairing, is
The codon is, thus, 5^{\prime} CUU 3^{\prime}.