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

• A. It carries amino acids to the ribosome
• B. It specifies the order of amino acids in a protein
• C. It forms part of the ribosome's structure
• D. It catalyzes chemical reactions

Answer: (B)

Messenger RNA (mRNA) plays a crucial role in protein synthesis by specifying the order of amino acids in a protein. This process begins when a gene in DNA is transcribed to produce mRNA, which then exits the nucleus and moves to a ribosome in the cytoplasm. The sequence of nucleotides in the mRNA is read in sets of three, known as codons, each of which corresponds to a specific amino acid.

During translation, the ribosome reads the mRNA sequence and recruits the appropriate transfer RNA (tRNA) molecules, which bring the correct amino acids according to the codon sequences. This defined sequence of amino acids is essential for the proper formation and function of proteins, ultimately determining their structure and activity within the cell.

The accuracy of mRNA in determining the amino acid sequence underscores its vital function in conveying the genetic instructions necessary for protein synthesis, distinguishing it from other cellular components like amino acids, ribosomal RNA (rRNA), and enzymes involved in catalyzing reactions.