If the $DNA$ of $E. coli$ is $1.36 \ mm$ long,how many base pairs $(bp)$ does it contain?
- A$7 \times 10^{6} \ bp$
- B$3 \times 10^{6} \ bp$
- C$2 \times 10^{6} \ bp$
- D$4 \times 10^{6} \ bp$
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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.
$\quad P \quad Q$
$\quad P \quad Q$
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