Why do complementary nucleotides across the double-stranded dna bond together using hydrogen bonds rather than covalent bonds?

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26-03-2017
Biology

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Why do complementary nucleotides across the double-stranded dna bond together using hydrogen bonds rather than covalent bonds?

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taskmasters taskmasters · Answer 1 · 2017-04-08T18:01:34+02:00

Hydrogen bonds are much weaker than covalent bond because of its bond is formed through fundamentally electrostatic interactions.

Hydrogen bonds happen due to dipole-dipole attraction while covalent bonds happen when valence electrons are shared.

Reasons why complementary nucleotides across the double-stranded dna bond together using hydrogen bonds rather than covalent bonds are (1) the distance between two strands, (2) size of the bases, (3) geometry of each base.