NITROGENOUS BASES
-
These are most important constituent of both DNA
and RNA.
-
These are classified into two groups based upon
their structure.
-
PYRIMIDINES
o
It is heterocyclic (a cyclic compound with more
than one type of atoms) compound.
o
Pyrimidines constitute of three nitrogenous
bases
o
Thymine: -
§
Found only in DNA.
§
Chemical composition C5H6O2N2.
o
Cytosine: -
§
Found both in DNA and RNA.
§
Chemical composition is C4H5ON3.
o
Uracil: -
§
Found only in RNA.
§
Chemical composition is C4H4O2N2.
-
PURINES
o
It is a pyrimidine ring that is attached to
another 5-membered ring.
o
Purines constitute of two nitrogenous bases.
o
Adenine: -
§
Found both in DNA and RNA.
§
Chemical composition is C5H5N5.
o
Guanine: -
§
Found both in DNA and RNA.
§
Chemical composition is C5H5ON5.
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