Page 76 - The Miracle in the Cell
P. 76

The region of DNA in
                 which the protein's gene                          NUCLEUS
                     is recorded.

                 TRANSCRIPTION

                                      RNA
                                    exon  intron  exon  intron  exon
                                               Unwanted codons are
               The copying out of RNA
                                               discarded.           Nuclear
                                                                   membrane
                                             exon





                                          Ribosomal
                                 tRNA  or RNA pieces  or mRNA



               The pool of amino                                    CYTOPLASM
               acids, tRNA
               molecules and
               ribosomal subunits
               found in the
               cytoplasm





                                                                  TRANSLATION






                                                  Production of the
                                                 polypeptide chain on
                                                    the ribosome
                                                                  PROTEIN


                                                                 For use inside the
                                                                 cell or for export
                                                                 out of the cell


                               Figure 3.8 Overview of protein synthesis


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