Which type of RNA is referred to by the abbreviation mRNA?

• A. Messenger RNA
• B. Mitochondrial RNA
• C. Monosome RNA
• D. Methylene RNA

Answer: (A)

The abbreviation mRNA stands for messenger RNA. This type of RNA carries the genetic message from DNA in the nucleus to the ribosome in the cytoplasm, where the information is used to build a protein. It acts as the template that specifies the sequence of amino acids through codons—three-nucleotide words—each coding for a particular amino acid. The term “messenger” reflects its role in conveying the genetic instructions from genes to the protein-synthesis machinery.

Other RNA types have different roles: rRNA forms part of the ribosome’s structure, tRNA brings amino acids to the growing protein chain, and while mitochondrial RNA exists, it’s not the general meaning of mRNA. So the correct interpretation is messenger RNA.