Question

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

(1) 1' C pentose sugar

(2) 2' C pentose sugar

(3) 3' C pentose sugar

(4) 5' C pentose sugar

Comments

Molecular basis of inheritance

Answer 1

Ans: (1) 1' C pentose sugar

Sol. The correct answer is option (1) as in the polynucleotide chain of DNA, a nitrogenous base is linked to the –OH of 1' C of pentose sugar. 

Option (3) and (4) are incorrect as phosphodiester bond is present between 3' carbon of sugar of one nucleotide to the 5' carbon of the sugar of the succeeding nucleotide.

Answer 2

The nitrogenous base is linked to the oh of 1-C of the pentose sugar.