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Two strands of DNA are held together by -

  • A.Covalent bonds
  • B.Hydrogen bonds
  • C.Electrostatic force
  • D.Van der waals' forces

Answer: B

The two strands of DNA are held together by hydrogen bonds between the paired bases - two between adenine and thymine, three between guanine and cytosine.

Each bond is weak, but there are millions along the molecule, so the double helix is stable while still coming apart strand by strand for replication.

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