Why mRNA is needed to act as a messenger?

mRNA, or messenger RNA, is crucial because it serves as a copy of the genetic information encoded in DNA, facilitating the transfer of this information from the nucleus to the ribosomes, where proteins are synthesized. This process is essential for gene expression, as mRNA translates the genetic code into proteins that perform various functions within the cell. Without mRNA, the instructions for building proteins would remain locked in the DNA, preventing cells from carrying out essential biological processes.