Who isolated DNA for the first time from pus cell
Why is DNA called polynuvleotide?
What are the three chemically essential parts of nucleotides constituting DNA?

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Solution

Friedrich Miescher isolates DNA for the first time.

A molecule composed of 13 or more nucleotide monomers covalently bonded is known as polynucleotide. DNA is composed of nucleotides joined together to make a long chain called polynucleotide.

The three chemically essential part od DNA is phosphate group, pentose sugar and a nitrogenous base.

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