A) left-handed helix with 12 nucleotide pairs per turn
B) right-handed helix with 11 nucleotide pairs per turn
C) right handed helix with 12 nucleotide pairs per turn
D) left-handed helix with 11 nucleotide pairs per turn
Correct Answer: B
Solution :
In A-DNA a single turn of right handed helix contains 11 base pairs which are tilted \[{{20.2}^{o}}\] away from perpendicular to helix axis, diameter is \[23\overset{\text{o}}{\mathop{\text{A}}}\,\]and the axial rise or distance between successive base pairs is \[2.56\,\overset{\text{o}}{\mathop{\text{A}}}\,.\]
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