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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 type of chemical bonds that hold the parts of each nucleotide  together is a hydrogen bond. It connects each nitrogenous base of  nucleotide in DNA and RNA.ovalent bonding holds CuCl2 together. Covalent bonding is a shared electron pairing of electrons from a non-metal and a metal. For the sake of your chemistry professor's sani â¦ ty please memorize the metals and nonmetals on the periodic table. In fact just memeorize the periodic table.