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| Introduction |
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| Nucleic acids are giant macromolecules having a complex structure and very high molecular weight. They are polymers of nucleotides and hence, described as polynucleotides. |
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| There are two types of nucleic acids found in a cell, namely, deoxyribose nucleic acid (DNA) and ribose nucleic acid (RNA). |
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| In a nucleic acid molecule, the phosphate component attached to the 5th carbon of one nucleotide forms a linkage with the next nucleotide at the 3rd carbon. This linkage is called 'phospho-diester linkage' and the bond formed is called 'phospho-diester bond'. These 3'-5' phospho-diester bonds provide considerable rigidity to the polynucleotide chain. |
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| Structure of a Dinucleotide |
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