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Q.
Wilkins X-ray diffraction showed the diameter of the DNA helix as
Chhattisgarh PMTChhattisgarh PMT 2007
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 $20\,\mathring{A}$.