A) 20 nm
B) 0.34 nm
C) 3.4 nm
D) 2 nm
Correct Answer: C
Solution :
B-DNA is helical structure with 20A diameter and the distance between the two base pairs is 3.4 \[\overset{o}{\mathop{A}}\,\] and there are 10 base pairs in each turn or pitch (one round). Hence, one turn of the helix is approximately 34\[\overset{o}{\mathop{A}}\,\] or 3.4 nm (10 \[\overset{o}{\mathop{A}}\,\]= 1.0 nm)
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