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Standard X
Biology
DNA
Question

The diameter of DNA molecule is
  1. 10˚A
  2. 100˚A
  3. 200˚A
  4. 20˚A

A
10˚A
B
100˚A
C
20˚A
D
200˚A
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Solution
Verified by Toppr

DNA is made of two ("duplex DNA") dextrogyre (like a screw, right- handed) helical chains or strands ("the double helix"), coiled around an axis to form a double helix of 20˚A of diameter. The two strands are antiparallel. The general appearance of the polymer shows a periodicity of 3.4˚A, corresponding to the distance between 2 bases, and another one of 34˚A, corresponding to one helix turn.
So, the correct answer is "20˚A".

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