If the mRNA codon sequence is GAC, the tRNA anticodon sequence would be

If the mRNA codon sequence is GAC, the tRNA anticodon sequence would be

• A. GAC
• B. Exon
• C. CUG
• D. Intron

Answer: (C)

The match between codon and anticodon comes from complementary base pairing in RNA and the opposite orientation of the two strands. The codon on mRNA is read 5' to 3' as GAC. The tRNA anticodon must be complementary and antiparallel, so each position pairs G with C, A with U, and C with G. Written in the standard 5' to 3' orientation, the anticodon is CUG. This anticodon will pair with GAC during translation to bring in the corresponding amino acid. Terms like exon or intron refer to gene structure, not to tRNA anticodons, so they don’t fit as anticodons.

The match between codon and anticodon comes from complementary base pairing in RNA and the opposite orientation of the two strands. The codon on mRNA is read 5' to 3' as GAC. The tRNA anticodon must be complementary and antiparallel, so each position pairs G with C, A with U, and C with G. Written in the standard 5' to 3' orientation, the anticodon is CUG. This anticodon will pair with GAC during translation to bring in the corresponding amino acid. Terms like exon or intron refer to gene structure, not to tRNA anticodons, so they don’t fit as anticodons.