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1. The DNA double helix is held together by two types of bonds, covalent andhydrogen. Covalent bonds occur within each linear strand and strongly bond thebases, sugars, and phosphate groups (both within each component and betweencomponents).Hydrogen bonds occur between the two strands and involve a basefrom one strand with a base from the second in complementary pairing.ovalent bonds occur within each linear strand and strongly bond thebases, sugars, and phosphate groups (both within each component and betweencomponents). Hydrogen bonds occur between the two strands and involve a basefrom one strand with a base from the second in complementary pairing.
  The two strands are held together by Hydrogen bonds. These are much weaker than a covalent bond and form between two molecules of opposite polarity. The two atoms, which are of positive and negative charge, are attracted to each other. That attraction is what constitutes a Hydrogen bond.ase pairs in DNA are attached to each other via hydrogen bonds. The base pairs are attached to the backbone by covalent bonds.