The reason for double helical structure of DNA is operation of

  • Option 1)

    van der Waal's forces

  • Option 2)

    dipole-­dipole interaction

  • Option 3)

    hydrogen bonding

  • Option 4)

    electrostatic attractions.

 

Answers (1)

As we lernt in

Structure of DNA -

Double helix consisting of two strands that are antiparallel and complementary to each other . Two helixes are held together by hydrogen bonds.

- wherein

 

Parallel strands of DNA form helix which are held together by hydrogen bonds.


Option 1)

van der Waal's forces

This option is incorrect

Option 2)

dipole-­dipole interaction

This option is incorrect

Option 3)

hydrogen bonding

This option is correct

Option 4)

electrostatic attractions.

This option is incorrect

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