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Q.
Width of the DNA molecule is
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Solution:
The 3-D structure of DNA is represented by a double helix, in which each turn has a diameter of 34 $ \overset{\text{o}}{\mathop{\text{A}}}\, $ and contains 10 base pairs at a distance of 3.4 $ \overset{\text{o}}{\mathop{\text{A}}}\, $ . The width of DNA molecule is 20 $ \overset{\text{o}}{\mathop{\text{A}}}\, $ .