Question

The diameter of DNA molecule is

• A. $ 15\,\overset{\text{o}}{\mathop{\text{A}}}\, $
• B. $ 20\,\overset{\text{o}}{\mathop{\text{A}}}\, $
• C. $ 25\,\overset{\text{o}}{\mathop{\text{A}}}\, $
• D. $ 34\,\overset{\text{o}}{\mathop{\text{A}}}\, $

Answer 1

Answer: (B)

Double helical model of DNA was proposed of Watson and Crick. Each turn of DNA was 10 base pairs at a distance of 3.4 A. The diameter of DNA molecule is 20 $ \overset{\,\,0}{\mathop{A}}\, $ .