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The reason for double helical structure of DNA is operation of

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The reason for double helical structure of DNA is operation of
(a) van der Waal's forces
(b) dipoledipole interaction
(c) hydrogen bonding
(d) electrostatic attractions.

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(c) : The two polynucleotide chains or strands of DNA are linked up by hydrogen bonding between the nitrogenous base molecules of their nucleotide monomers.

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