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  4. The reason for double helical structure of DNA is operation of

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Q. The reason for double helical structure of DNA is operation of

Rajasthan PMTRajasthan PMT 2008

Solution:

Hydrogen bonding is involved molecular force in the DNA molecule. Watson and Crick observed the purine-pyrimidine type of hydrogen bonding (instead of purine-purine and pyridine-pyridine)