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The mean diameter of the DNA double helix is :
Option: 1
20 angstrom
Option: 2
3.4 angstrom
Option: 3
4.5 angstrom
Option: 4
10 angstrom
Answers (1)
As discussed in Salient Features of Double-Helix Structure of DNA -The diameter of the DNA helix is 2 nm and the vertical rise per base pair is 0.34 nm. A DNA molecule is composed of two unbranched polynucleotide chains (strands) that wind about each other into a structure called a double helix.
Hence, the correct option is (a).
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