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

In the polynucleotide chain of DNA, a nitrogenous base is linked to the -OH of:
  1. 2'C pentose sugar
  2. 3'C pentose sugar
  3. 5'C pentose sugar
  4. 1'C pentose sugar

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 have1'-1'  linkage i.e., pentose sugar carbon 1' and 1' position of thymine/cytosine).

Asked in: NEET 2020 (Phase 2)

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