A) \[10\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[20\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[30\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[40\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: B
Solution :
On the basis of X-ray diffraction studies J D Watson, F H C Crick, M H F Wilkins and R Franklin (1853) have shown that the DNA molecule is not straight like a ladder but two long arms are spirally twisted around each. other forming a double helix. According to Wilkins X-ray diffraction, the diameter of the DNA helix is 20A.
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