Answer:
mRNA, or messenger-RNA, contains the codons used in the process of translating RNA into proteins. The tRNA, or transfer-RNA molecules, contain the anti-codon.
Each tRNA has an amino acid attached by an aminoacyl tRNA synthetase. The amino acid attached by this enzyme corresponds to the codon with which the anti-codon on the tRNA will pair. The anti-codon is the set of complementary base pairs to the codon; if the codon reads 5' AUG 3', the anti-codon will read 5' UAC 3'. (The amino acid that will attach to this specific tRNA is methionine, the amino acid that signals a start to translation and will thus begin every polypeptide chain translated.)