SEARCH Articles Figures Tables A segment of a ribonucleic acid —are held together by phosphodiester bonds between ribo-syl moieties attached to the nucieobases by N-giycosidic bonds. Note that the polymer has a polarity as indicated by the iabeied 3 -and 5 -attached phosphates. [Publishers Imprint] [Publishers Imprint] [Publishers Imprint] [Publishers Imprint] [Publishers Imprint] [Publishers Imprint]