The reason for double helical structure of DNA
is operation of
(a) dipole-dipole interaction
(b) hydrogen bonding
(c) electrostatic attractions
(d) van der Waals’ forces
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Answer:
(b) hydrogen bonding.
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(b) hydrogen bonding
Explanation:
The reason for double helical structure of DNA is operation of hydrogen bonding. The two polynucleotide chains or strands of DNA are linked up by hydrogen bonding between the nitrogenous base molecules of their nucleotide monomers. Adenine-Thymine (two hydrogen bonds) and Cytosine-Guanine (three hydrogen bonds).
Option B is the answer.
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