Which type of RNA is involved in attaching amino acids to form proteins?

Transfer RNA (tRNA) plays a crucial role in the process of protein synthesis by being responsible for transporting the correct amino acids to the ribosome, where proteins are assembled. Each tRNA molecule carries a specific amino acid and has an anticodon that pairs with the corresponding codon on the messenger RNA (mRNA) strand. This ensures that amino acids are added in the correct sequence according to the genetic code, which is essential for forming functional proteins.

In contrast, messenger RNA (mRNA) serves as the template for protein synthesis, carrying the genetic code from DNA to the ribosome. Ribosomal RNA (rRNA) is a structural component of ribosomes, which are the sites of protein synthesis, but it does not directly transport amino acids. Small nuclear RNA (snRNA) is involved in RNA splicing and processing rather than in the translation of proteins. Therefore, the primary function of tRNA in linking amino acids to form proteins clearly establishes it as the correct answer.