DEOXYRIBONUCLEIC ACID (DNA)
• DNA is the largest macromolecule which consists
of two complementary strands of deoxyribo-
nucleotides that run antiparallely.
• It is composed of small monomeric units called
nucleotides. Nucleotides (deoxyribonucleotides)
are made up of a pentose sugar (deoxyribose type),
a phosphate group and a nitrogenous base.
The pentose sugar and the nitrogenous base
constitute nucleosides. Nitrogen base is linked
to pentose sugar through N-glycosidic linkage
to form a nucleoside. There are four nucleosides
in DNA, differ from each other in the type of the
nitrogenous base which could be adenine (A),
guanine (G), thymine (T) or cytosine (C).
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