Diameter of DNA is constant due to

Hydrogen bonds between base pairs

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Phosphodiester bond

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Disulphide bond

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Covalent bonds

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Solution

The correct option is A Hydrogen bonds between base pairs
The base pairing, i.e. H-bond stabilises the three-dimensional structure of DNA, i.e. diameter of DNA also. The bases in DNA can interact via hydrogen bonds. The two strands of the DNA molecule are held together with the help of hydrogen bonds.

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