During translation, what molecule is responsible for carrying amino acids?

• A. mRNA
• B. tRNA
• C. rRNA
• D. DNA

Answer: (B)

During translation, transfer RNA (tRNA) is the molecule responsible for carrying amino acids to the ribosome, where protein synthesis occurs. Each tRNA molecule has a specific anticodon sequence that pairs complementary with the codon on the messenger RNA (mRNA), allowing the tRNA to deliver the correct amino acid corresponding to the genetic code.

The structure of tRNA features an acceptor stem at one end where the appropriate amino acid binds, and its unique three-dimensional shape ensures that it correctly matches the codon sequence on the mRNA. This matching process is crucial for ensuring that proteins are assembled accurately according to the genetic instructions.

In contrast, mRNA serves as a template for the sequence in which the amino acids should be assembled during protein synthesis, but it does not carry amino acids itself. Ribosomal RNA (rRNA) is a structural and functional component of the ribosome, aiding in protein synthesis but not involved in carrying amino acids. Likewise, DNA contains the genetic information encoded for proteins but is not directly involved in the process of translating that information into amino acids during translation.