A) 15 Å
B) 20 Å
C) 25 Å
D) 34 Å
Correct Answer: B
Solution :
The 3-D structure of DNA is represented by a double helix, in which each turn has a diameter of 34 Å and contains 10 base pairs at a distance of 3.4 Å. The width of DNA molecule is 20 Å.
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