The document describes the process of transcription and translation in a cell. It shows that RNA polymerase unwinds DNA and binds to the promoter region to begin transcribing DNA into mRNA. The mRNA then exits the nucleus into the cytoplasm. In the cytoplasm, the mRNA binds to a ribosome where it is translated into a protein as amino acids are added one by one according to the mRNA codons. The ribosome continues translating until it reaches a stop codon and a completed protein is released.