Isoacceptor tRNAs are a group of transfer RNAs (tRNAs) that read different codons but carry the same amino acid. These tRNAs are essential in the translation process of protein synthesis. Each tRNA has an anticodon that pairs with a specific mRNA codon, ensuring the correct amino acid is added to the growing polypeptide chain. The presence of multiple tRNAs for a single amino acid allows for the flexibility and efficiency of the genetic code.