The document summarizes the process of protein synthesis: 1) Transcription occurs in the nucleus where RNA polymerase copies DNA into mRNA which is exported to the cytoplasm through nuclear pores. 2) In the cytoplasm, ribosomes read the mRNA and bring corresponding tRNAs to add amino acids specified by codons, forming peptide bonds between amino acids. 3) This process continues until a stop codon is reached, releasing the completed polypeptide chain that folds into its tertiary structure to function as a protein.