A) \[10,\]\[3.4\,\overset{{}^\circ }{\mathop{A}}\,\]
B) \[10,\]\[34\,\overset{{}^\circ }{\mathop{A}}\,\]
C) \[11,\]\[20\,\overset{{}^\circ }{\mathop{A}}\,\]
D) \[11,\]\[34\,\overset{{}^\circ }{\mathop{A}}\,\]
Correct Answer: B
Solution :
[b] In B-DNA, one turn of the helix has about 10 nucleotides on each strand of DNA. A turn occupies a distance of about 3.4 nm \[(34\overset{{}^\circ }{\mathop{A}}\,\]or\[3.4\times {{10}^{-9}}m)\] so that adjacent nucleotides or their bases are separated by a space of about 0.34 nm \[(0.34\times {{10}^{-9}}m\]or\[3.4\overset{{}^\circ }{\mathop{A}}\,).\]
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