What role does messenger RNA (mRNA) play in protein synthesis?

• A. It catalyzes the formation of peptide bonds
• B. It carries genetic information from DNA to ribosomes
• C. It is involved in the replication of DNA
• D. It serves only as a structural component of ribosomes

Answer: (B)

Messenger RNA (mRNA) plays a critical role in the process of protein synthesis by serving as the intermediary that carries genetic information from DNA to ribosomes, the cellular machinery that assembles proteins. During transcription, a segment of DNA is transcribed into mRNA, which encodes the sequence of amino acids that will form a protein.

Once synthesized, the mRNA molecule travels from the nucleus (where DNA is housed) to the ribosomes in the cytoplasm. Ribosomes read the sequence of codons present in the mRNA, and this information is used to assemble amino acids in the correct order to produce a specific polypeptide chain. This process, known as translation, relies on the accurate pairing of mRNA codons with transfer RNA (tRNA) molecules that bring the appropriate amino acids.

The other options do not accurately describe the function of mRNA in the context of protein synthesis. While catalysts like ribosomal RNA (rRNA) play a role in the formation of peptide bonds, it is not mRNA that performs this function. mRNA is not involved in the replication of DNA, which is a separate process that utilizes DNA polymerase. Additionally, while ribosomes are indeed made up of structural components including rRNA and proteins