A) \[234 \overset{\operatorname{o}}{\mathop{A}}\,\]
B) \[23.4 \overset{\operatorname{o}}{\mathop{A}}\,\]
C) \[0.34 \overset{\operatorname{o}}{\mathop{A}}\,\]
D) \[20 \overset{\operatorname{o}}{\mathop{A}}\,\]
Correct Answer: D
Solution :
20 A The width of a DNA molecule is 20 A.
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