A) \[15\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[20\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[25\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[34\overset{\text{o}}{\mathop{\text{A}}}\,\]
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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