In DNA purine nitrogen bases are :-

Nitrogen bases of DNA are

Nitrogen bases of DNA are

Nitrogen bases of DNA are

..................and........................are purine nitrogenous bases.

In a segment of DNA molecule there occurs 200 molecules of adenine nitrogen bases and 200 molecules of cytosine nitrogen bases. What will be the total number of purine nitrogen bases in this segment ?

Both purines and pyrimidines are nitrogen bases yet they differ. How?

Give one difference between purine and pyrimidine nitrogenous bases.