Final answer:
The anticodon that would bind to the mRNA codon 5'-AAC-3' is 3'-UUG-5', because anticodons are antiparallel and complementary to codons.
Step-by-step explanation:
In order for a tRNA molecule to bind to a mRNA codon, its anticodon must be complementary to that codon. Given the mRNA codon 5'-AAC-3', we need to find the anticodon that would match. mRNA codons are read in the 5' to 3' direction, and tRNA anticodons are aligned in an antiparallel fashion, meaning they too are read from 5' to 3', but opposite to the mRNA strand.
To determine the correct anticodon, we simply pair the complementary bases which are opposite in nature; Adenine (A) pairs with Uracil (U) and Cytosine (C) pairs with Guanine (G). Therefore, the anticodon that would bind to the mRNA codon 5'-AAC-3' is 3'-UUG-5'.