Here's why:

* tRNA structure: tRNA molecules have a specific cloverleaf-like structure with a unique sequence of nucleotides.

* Anticodon: One end of the tRNA molecule contains an anticodon, which is a sequence of three nucleotides that base-pairs with a complementary codon on mRNA.

* Amino acid attachment: The other end of the tRNA molecule has an attachment site for a specific amino acid.

* Role in translation: During protein synthesis (translation), tRNA molecules bring the correct amino acids to the ribosome, where they are added to the growing polypeptide chain according to the genetic code carried by mRNA.

Therefore, tRNA plays a crucial role in the process of translation by ensuring that the correct amino acids are incorporated into the polypeptide chain.