What is the primary function of tRNA during translation?

• A. To synthesize mRNA
• B. To carry amino acids to the ribosome
• C. To bind to DNA
• D. To aid in ribosome assembly

Answer: (B)

The primary function of tRNA (transfer RNA) during translation is to carry amino acids to the ribosome. Translation is the process by which the genetic code carried by mRNA is used to synthesize proteins. tRNA molecules have specific regions that allow them to recognize and bind to codons on the mRNA through their anticodon sequence. Each type of tRNA carries a specific amino acid corresponding to the codon it recognizes.

As the ribosome moves along the mRNA strand, tRNA brings the appropriate amino acids in the correct sequence, facilitating the formation of peptide bonds between adjacent amino acids, ultimately forming a polypeptide chain. This role is crucial for the accurate translation of the genetic code into functional proteins.

The other functions mentioned in the other response choices do not relate to tRNA's role in translation. mRNA synthesis is carried out by RNA polymerase, not tRNA. tRNA does not bind to DNA; it interacts with mRNA during translation. Additionally, while ribosomal assembly involves various ribosomal proteins and rRNA, tRNA does not aid in this assembly process. Thus, the correct emphasis on tRNA's role in transporting amino acids to the ribosome is fundamental to the translation process.