The RNA that has an anti-codon and attaches to a specific amino acid is called transfer RNA (tRNA).

Here's a breakdown:

* tRNA is a small RNA molecule that plays a crucial role in protein synthesis.

* Anticodon: Each tRNA molecule has a unique three-nucleotide sequence called an anticodon. This anticodon is complementary to a specific codon on the messenger RNA (mRNA).

* Amino Acid Attachment: The other end of the tRNA molecule is attached to a specific amino acid, corresponding to the anticodon it carries.

During protein synthesis, tRNA molecules deliver the correct amino acids to the ribosome, where they are added to the growing polypeptide chain according to the instructions encoded in the mRNA.