Purines found both in DNA and RNA are:
Adenine and thymine
Adenine and guanine
Guanine and cytosine
Cytosine and thymine
When a phosphaste group to - oH of a nucleoside through phosphoester linkage.
A corresponding nucleotide (or deoxynucleotide depending upon of sugar present) is formed.
Nucleic acids are composed of 3 components:
5 carbon sugars, and
one or more phospahte groups.
Nitrogenous bases are of two kinds i.e, purines and pyrimidines.
Adenine and guanine are purines while cytosine, thymine and uracil are pyrimidrines. In both the DNA and RNA purine are same while among pyrimidines, thymine is present in DNA and uracil in RNA.
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