The mRNA codon AUU corresponds to a tRNA anticodon. In tRNA, the bases pair with the mRNA codon in a complementary fashion, and since it's tRNA that interprets the mRNA, it will have the opposite bases:
- A pairs with U
- U pairs with A
- T (which would not be present in the tRNA itself, but we can think of the complementary pairing) is not relevant as tRNA does not have T; instead, it has U.
Thus, the tRNA anticodon that pairs with the mRNA codon AUU would be UAA.
So the correct response is:
UAA