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  4. The two strands of the DNA double helix are

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Q. The two strands of the DNA double helix are

Rajasthan PMTRajasthan PMT 2011

Solution:

Watson and Crick proposed double helical model of DNA. The two polynucleotide chains are bonded to form double helix by hydrogen bonds. There are two hydrogen bonds between A and T while three hydrogen bonds between G and C.