Final answer:
Each tRNA is specific to a single amino acid, determined by its anticodon and the unique shape that fits into its corresponding aminoacyl tRNA synthetase. Multiple tRNAs may exist for a specific amino acid, but they are all dedicated to carrying that one amino acid.
Step-by-step explanation:
A student is asking about the specificity of tRNA (transfer RNA) molecules to amino acids. While there exist various tRNAs for a particular amino acid, each tRNA is specific to only a single amino acid. This specificity is ensured by the unique anticodon region of tRNA that bonds with the corresponding codon on the mRNA during protein synthesis. Additionally, the exact shape of the tRNA allows it to fit into the active site of the corresponding aminoacyl tRNA synthetase, an enzyme that facilitates the attachment of the amino acid to the tRNA. Therefore, although there may be multiple tRNAs for a specific amino acid, each tRNA can carry only one type of amino acid, dictated by its anticodon and accepted by its specific aminoacyl tRNA synthetase.