A) 10
B) 9
C) 11
D) 12
Correct Answer: A
Solution :
Each turn of double helix contains ten paired nucleotides. Distance between two paired nucleotide is\[3.4\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]. By X-ray diffraction method, DNA in crystalline stage, the double helix makes one full turn every\[34\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\].
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