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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.
Best Answer: The answer is B. Hydrogen bonds occur between nitrogenous bases. In DNA the complementary base pairs are Adenine to Thymine, and Guanine to Cytosine. The phosphate and sugars are the DNA's backbone and are held together by phosphodiester bonds which are covalent.Remember that a hydrogen bond, compared to a covalent bond, is a much weaker bond.est Answer: The answer is B. Hydrogen bonds occur between nitrogenous bases. In DNA the complementary base pairs are Adenine to Thymine, and Guanine to Cytosine. The phosphate and sugars are the DNA's backbone and are held together by phosphodiester bonds which are covalent.