Questions: What tRNA anti-codon would match the mRNA codon -U-A-C-? -A-U-G- -U-T-C- -T-A-C- -U-A-C-

The answer is the first one (A): -A-U-G-

Explanation for each option:

1. -A-U-G-: This is the correct anti-codon. The mRNA codon -U-A-C- pairs with the tRNA anti-codon -A-U-G- through complementary base pairing (U pairs with A, A pairs with U, and C pairs with G).

2. -U-T-C-: This is incorrect because RNA does not contain thymine (T); it contains uracil (U) instead.

3. -T-A-C-: This is incorrect because RNA does not contain thymine (T); it contains uracil (U) instead.

4. -U-A-C-: This is incorrect because the anti-codon should be complementary to the mRNA codon, not identical to it.

Summary: The tRNA anti-codon that would match the mRNA codon -U-A-C- is -A-U-G-.