Question

The radius of DNA double helix is :- (1) 40 Å (2) 30 Å (3) 20 Å (4) 10 Å and pls explain your anwer

Answer 1

Answer:

The diameter of the DNA helix is 2 nm and the vertical rise per base pair is 0.34 nm (Van Holde 1989). A DNA molecule is composed of two unbranched polynucleotide chains (strands) that wind about each other into a structure called a double helix,

Explanation:

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Answer 2

Answer: The radius of DNA double helix is 10 Å.

Hence the correct answer is 10 Å.

Explanation: The DNA is made up of a two long ploy nucleotide strands coiled around a central axis(duplex DNA )and the strands were wrapped in a right handed helix with a helix diameter 20 Å. As the half radius is of the diameter i.e.

$radius=\frac{diameter}{2} \\\\r=\frac{d}{2}\\\\r=\frac{20}{2} \AA=10\AA$

The two strands of DNA are antiparallel to each other i.e. one strand is oriented in the 5'to 3' direction and other is 3' to 5' direction. The distance between two bases of the the DNA is 3.4 Å. There are 10.4  bases per helical turn.

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