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What is Nitrogenous Bases ?

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• The bases in nucleic acids are heterocyclic compounds containing nitrogen

and carbon in their rings. The nitrogenous bases are of two types:

1) Pyrimidines 2) Purines.

• Pyrimidines:

• Pyrimidine ring is similar to the benzene ring, except it contains nitrogen in

place of carbon at positions 1 and 3. They also contain a keto oxygen (=0) at

the position 2.

• There are three common pyrimidines-

• cytosine (C),

• thymine (T) and

• uracil (U).

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