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 :
Double helical model of DNA was proposed of Watson and Crick. Each turn of DNA was 10 base pairs at a distance of 3.4 A. The diameter of DNA molecule is 20 \[\overset{\,\,0}{\mathop{A}}\,\].
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