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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.
Confidence votes 379. Covalent (double and single, as well as polar and non-polar) and Hydrogen bonds are found in the DNA molecule. The backbone of DNA is made of of Phosphate (PO43-) molecules and the sugar Deoxyribose (C5H10O4) Attatched to every sugar is a Base (C, G, A or T.) These are held together by single covalent bonds. Within the Phosphate, there is one double covalent bond (meaning two pairs of electrons are shared.).