There are four different nitrogenous bases are present, from which two have double ring and two have single ring structure. these bases are adenine , guanine, cytosine and thymine .
there are purines and pyrimidines.purines are adenine and guanine whereas pyrimidines are thiamine and cytosine.
The nitrogenous bases found in DNA are: Adinine(A),Thymine(T),Cuisine(C) and Guanine (G).
These are complementary to each other and the bonding is : A=T(double bond) and C with G by triple bond.
The types of the N-bases in DNA are:
1.Adenine(A)
2.Guanine(G)
3.Thymine(T) or Uracil(U) {present in RNA instead of T }
4.Cytosine(C)
The first two are called Purines & the last two are called Pyrimidines.
Adenine, thymine,Gaunine and cytosine in DNA
Where as in RNA thymine is replaced with uracil.
Purines-> Adenine(A), Guanine(G) and
Pyrimidines-> Cytosine(C), Thymine(T).
Four nitrogen bases are present in DNA as adenine(A), guanine(G), cytosine(C) and thymine(T). Out of which adenine and guanine are purines and cytosine and thymine are pyrimidines. In DNA, the double stranded structure is formed by bond formation between purines and pyrimidines. Adenine makes bond with thymine and guanine makes bond with cytosine.
