Explain the mechanism of formation of bonds between the nucleotides of one DNA polynucleotide chain.

Each nucleotide consists of a nitrogenous base, a sugar (deoxyribose), and a phosphate group. The bonds between nucleotides in the polynucleotide chain are formed by deoxyribose and the phosphoric acid residue. Phosphate groups form covalent phosphodiester bonds between the third and fifth carbon atoms of neighboring deoxyribose molecules.

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