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# A DNA double helix is 340 nm long. The number of nucleotides in this DNA is

$\begin {array} {1 1} (1)\;2000 & \quad (2)\;1000 \\ (3)\;200 & \quad (4)\;20 \end {array}$

Can you answer this question?

(1) 2000
answered Nov 7, 2013 by