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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.
Hydrogen bonds join the bases of complementary DNA strands. Three hydrogen bonds form between adenine and guanine, while two hydrogen bonds form between cytosine and thymine. Hydrogen bonds join the bases of complementary DNA strands. Three hydrogen bonds form between adenine and guanine, while two hydrogen bonds form between cytosine and thymine.