Which of the following contributes to the double helical structure of DNA?

Hydrogen bond

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Covalent bond

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Disulphide bond

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Van der Waals' force

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Solution

The correct option is A Hydrogen bond
According to double helical model of DNA (proposed by Watson and Crick), DNA molecule contains two deoxyribonuclide chains which are spirally coiled around each other on a common axis. These two chains are held together by the formation of hydrogen bonds,

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