Of course, we need raw material. The object here is to make protein. And protein is just a string of amino acids. Floating around in the cytoplasm are compact, highly folded molecules of transfer RNA (tRNA) attached to amino acids. Each one of these tRNA’s is different. For example, the very first amino acid in any new protein is always methionine (because AUG, the start codon, is also the the codon for methionine). So the very first tRNA grabbed by the ribosome is methionyl-tRNA, a tRNA that carries methionine. Now, you can’t just hook up a generic tRNA to methionine. You need some way of translating the codon in the message to a specific amino acid. This means you need twenty different tRNA’s for twenty different amino acids. So the tRNA for methionine has a particular region called the anticodon, the region that recognizes the codon of the mRNA.  If you look at the structure for methionyl tRNA, you see a crumpled up strand of RNA with a UAC – the anticodon for AUG --- sticking out one end, and a methionine sticking out the other. Using the information contained in Table I , can you predict the possible anticodons for tyrosyl-tRNA?