Here's why:
* DNA in the Nucleus: The genetic instructions for building and maintaining an organism are encoded in DNA, which is located in the nucleus of the cell.
* Transcription: When a gene needs to be expressed, its DNA sequence is copied into a messenger RNA (mRNA) molecule. This process is called transcription.
* mRNA Translocation: The newly synthesized mRNA molecule then leaves the nucleus and enters the cytoplasm.
* Translation: In the cytoplasm, the mRNA molecule interacts with ribosomes, which are the protein synthesis machinery of the cell. The ribosome "reads" the mRNA code and translates it into a specific protein sequence.
So, mRNA acts as a messenger, carrying the genetic instructions from the nucleus to the cytoplasm where proteins are made.
