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