During initiation of translation, which components come together?

During initiation of translation, which components come together?

• A. mRNA, tRNA, and the first amino acid
• B. Ribosome, mRNA, and DNA
• C. tRNA, rRNA, and the ribosomal protein
• D. RNA polymerase, promoter, and terminator

Answer: (A)

Initiation of translation hinges on the direct pairing of the genetic message with the molecule that reads it. The mRNA provides the start codon and subsequent codons, while the initiator tRNA is charged with the first amino acid and recognizes that start codon. When these two come together at the ribosome, the first amino acid is correctly placed to begin the growing polypeptide chain, and the ribosome assembles around them to form the initiation complex. That’s why the essential trio is mRNA, the initiator tRNA carrying the first amino acid. The other options mix in DNA, transcription machinery, or other ribosomal components that aren’t the initiating pairing.

Initiation of translation hinges on the direct pairing of the genetic message with the molecule that reads it. The mRNA provides the start codon and subsequent codons, while the initiator tRNA is charged with the first amino acid and recognizes that start codon. When these two come together at the ribosome, the first amino acid is correctly placed to begin the growing polypeptide chain, and the ribosome assembles around them to form the initiation complex. That’s why the essential trio is mRNA, the initiator tRNA carrying the first amino acid. The other options mix in DNA, transcription machinery, or other ribosomal components that aren’t the initiating pairing.