A DNA polymer has a free phosphate group at o | vedclass

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(D) In a $DNA$ polynucleotide chain,the sugar-phosphate backbone is formed by phosphodiester bonds.At the $5^{\prime}$ end of the polynucleotide chain

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$5^{\prime} \quad 3^{\prime}$

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(D) In a $DNA$ polynucleotide chain,the sugar-phosphate backbone is formed by phosphodiester bonds.At the $5^{\prime}$ end of the polynucleotide chain,the $5^{\prime}$ carbon of the deoxyribose sugar is attached to a free phosphate group.At the $3^{\prime}$ end of the polynucleotide chain,the $3^{\prime}$ carbon of the deoxyribose sugar has a free hydroxyl $(-OH)$ group.Therefore,the end with the free phosphate group is the $5^{\prime}$ end $(P = 5^{\prime})$ and the end with the free $-OH$ group is the $3^{\prime}$ end $(Q = 3^{\prime})$.

$A$ $DNA$ polymer has a free phosphate group at one end of the sugar,which is called the $P$ end of the polynucleotide chain. Similarly,at the other end of the polymer,there is a free $OH$ group of the sugar,which is called the $Q$ end of the polynucleotide chain.
$\quad P \quad Q$

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$A$ $DNA$ polymer has a free phosphate group at one end of the sugar,which is called the $P$ end of the polynucleotide chain. Similarly,at the other end of the polymer,there is a free $OH$ group of the sugar,which is called the $Q$ end of the polynucleotide chain.$\quad P \quad Q$