In the structure of nucleic acids, A phosphodiester linkage is formed between ----- and ------- positions of ribose sugar moities

One of the sugar moiety involves its 5th -CH2OH group to condense with a -OH group of phosphoric acid;The other -OH group of the same phosphoric acid molecule condenses with 3rd -OH group of the other sugar moiety;Thus a phosphodiester linkage devoleps between 5' and 3' carbon atoms of two sugar moities;