Here's a breakdown:

* DNA: The genetic blueprint of an organism. It contains the instructions for building and maintaining the organism.

* Transcription: The process where a segment of DNA is copied into a molecule of mRNA. This happens in the nucleus of a cell.

* mRNA: A messenger molecule that carries the genetic code from the DNA in the nucleus to the ribosomes in the cytoplasm.

The mRNA molecule then serves as a template for protein synthesis, where the genetic code is translated into a specific protein sequence.