A) 0.34 nm
B) 20 nm
C) 2nm
D) 3.4 nm
Correct Answer: D
Solution :
B-form of DNA shows right-handed coiling which contains 10 base pairs in each turn. On complete turn, DNA occupies 34 A distance. So in nm, it will 3.4 nm because or. \[\begin{align} & 1nm={{10}^{-9}}m \\ & 1\overset{\text{o}}{\mathop{\text{A}}}\,={{10}^{10}}m \\ & 34\overset{0}{\mathop{\text{A}}}\,=34x{{10}^{10}}m \\ & =3.4nm \\ \end{align}\] So,
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