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  •  The two antiparallel strands in a DNA double helix are held together by :  Option: 1 Hydrogen bond  <div

 The two antiparallel strands in a DNA double helix are held together by :
 

Option: 1

Hydrogen bond
 


Option: 2

electrostatic force of attraction
 


Option: 3

 gravitational force
 


Option: 4

van der Waals force
 


Answers (1)

best_answer

 

 

As learnt in Salient Features of Double-Helix Structure of DNA -

 

The bases in two strands are paired through hydrogen bond (H-bonds) forming base pairs (bp). Adenine forms two hydrogen bonds with Thymine from the opposite strand and vice-versa. Similarly, Guanine is bonded with Cytosine with three H-bonds.
Hence, the correct option is (a).

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