A) 0.34 nm
B) 20 nm
C) 2 nm
D) 3.4 nm
Correct Answer: D
Solution :
B-form of DNA shows right handed coiling which contains 10 base pairs in each turn. One complete turn of DNA occupies \[34\,\overset{\text{o}}{\mathop{\text{A}}}\,\] distance so in nm it will 3.4 nm because \[1nm={{10}^{-9}}m\] \[1\overset{\text{o}}{\mathop{\text{A}}}\,={{10}^{-10}}m\] \[34\overset{\text{o}}{\mathop{\text{A}}}\,=34\times {{10}^{-10}}m\] or \[=3.4\times {{10}^{-9}}m\] So, = 3.4 nm.
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