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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 two strands of a DNA molecule are held together by hydrogen bonds that occur between the nitrogen bases of both strands. The hydrogen bonds occur between the adenine and t â¦ hymine nitrogen bases and between the cytosine and guanine nitrogen bases.Hydrogen boding occurs between Nitrogen or oxygen atoms (containing lone pairs of electrons in their outer orbital) and hydrogen atoms.n DNA hydrogen bonds are typically found between the Nucleobases; the four chemicals that act to transcript the genetic code, Cytosine, Guanine, Adenine, and Thymine.   â¦  These bases are attached to the sugar and phosphate backbone of the DNA ladder, and the bases themselves make up the rungs.