A nucleoside is composed of purine or
pyrimidine base and a pentose sugar. Two types of pentose sugar are present in
nucleoside, they are ribose and deoxy ribose (Fig. 7.3). In the case of purine
nucleosides, the sugar is attached to N-9 of the purine ring, whereas in
pyrimidine nucleosides, the sugar is attached to N-1 of the pyrimidine ring.
The type of linkage is N-glycosidic linkage (Fig. 7.4).
Nucleotides are phosphorylated nucleosides
usually one or two of hydroxyl groups of ribose (or) deoxyribose are
phosphorylated. Thus a nucleotide has three structural components. They are
nitrogenous base, sugar and phosphate. Phosphate is attached to ribose (or)
deoxy ribose through an ester linkage (Fig.7.5).
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