Basically there are four nitrogenous bases in the DNA which is Adenine, thymine , cytosine and guanine .
There are 4 Nitrogenous bases present in the DNA :-
Adenine,Guanine,Thymine and Cytosine.
Adenine and Guanine are classified as Purines while Thymine and Cytosine are classified as Pyrimidines.
adenine paired with thymine
guanine paired with cytosine
purines and pyrimidines
purines- adenine and guanine
pyrimidines- cytosine , uracil(in RNA only ) and thymine.
therefore 4 types.
^_^
Nitrogen bases are classified into two types-
1)Purines–eg guanine, adenine
2)Pyrimidines–eg cytosine, uracil , thymine
just search in google for full info …lol
There are 4 types of nitrogenous base (i) Adenine(ii) Guanine(iii) cytosine(iv) Thymine
In DNA two types of nitrogenous base are formed :- theses are -(1) purine – is a double ring structure present in the form of adnine and guanine. (2) pyrimidine – is a single structure present in the form of cytosine and thymine.