The document summarizes the process of transcription and translation in protein synthesis. During transcription, RNA polymerase in the nucleus copies DNA to produce mRNA. The mRNA exits the nucleus and binds to ribosomes in the cytoplasm during translation. tRNAs bring amino acids to the ribosome according to the mRNA code, linking the amino acids together to form a protein chain. Once a stop codon is reached, the protein is complete and released. This two-step process explains how genetic code in DNA is used to synthesize proteins.