In the beginning -- of the ribosome, the cell's protein-building workbench -- there were ribonucleic acids, the molecules we call RNA that today perform a host of vital functions in cells.

In the beginning â?? of the ribosome, the cellâ??s protein-building workbench â?? there were ribonucleic acids, the molecules we call RNA that today perform a host of vital functions in cells. And ...