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Illustrate a glycosidic, peptide and a p...

Illustrate a glycosidic, peptide and a phospho-diester bond.

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In a nucleic acid a phosphate moiety links the 3. carbon of one sugar of one nucleotide to the 5. carbon of the sugar of the succeding nucleotide. The bond between the phosphate and hydroxyl group of sugar is an ester bond. As there is one such ester bond on either side, it is called phosphodiester bond.
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