The document summarizes the process of protein synthesis. DNA in the nucleus is transcribed into mRNA by RNA polymerase. The mRNA strand then exits the nucleus through the nuclear pore and binds to a ribosome in the cytoplasm. Transfer RNA molecules deliver amino acids to the ribosome based on base pairing between the mRNA and the tRNA anticodon. The amino acids are linked together through peptide bonds to form a polypeptide chain, which later folds into its tertiary structure to become a functional protein.