When in the process of protein synthesis a section of the DNA molecule is copied into which other molecule?

During protein synthesis, a section of the DNA molecule is copied into messenger RNA (mRNA) through a process called transcription. This occurs in the cell nucleus, where the DNA strands unwind, and RNA polymerase synthesizes the mRNA strand using one of the DNA strands as a template. The mRNA then carries the genetic information from the DNA to the ribosome, where translation occurs, leading to protein formation.