In the polynucleotide chain of DNA , a nitrogenous base is linked to the - OH of:

Step-by-step solution

N - glycosidic linkage : A nitrogenous base is linked to the pentose sugar through a N - glycosidic linkage to form a nucleoside. Purine nucleosides have 1 ' - 9 glycosidic linkage (carbon 1 ' of pentose sugar and 9 ' nitrogen of adenine/guanine). Pyrimidine nucleosides have 1 ' - 1 ' linkage i.e., pentose sugar carbon 1 ' and 1 ' position of thymine/cytosine).