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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.
2015-02-15T06:31:42-05:00. The hydrogen bonds could be seen as the horizontal bars across the ladder, as in DNA they are found between the backbones. The sugar-phosphate backbones could be seen as the 2 vertical, long parts either side or the ladder. This is because in DNA the backbones run along either side of the hydrogen bonds and bases.