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They hold the two strands of DNA together. The nitrogenous bases in DNA are A (adenine), C (cytosine), G (guanidine), and T (thymine). In each of these bases, the nitrogen of the secondary amine bonds to the deoxyribose in the backbone. DNA consists of two strands running in opposite directions. The hydrophobic nitrogenous bases are on the inside, hidden from water. Hydrogen bonds between the nitrogenous base hold the two strands of DNA together. These hydrogen bonds are base specific. That is, A (adenine) can form hydrogen bonds only with T (thymine). C (cytosine) can form hydrogen bonds only with G (guanine). The thymine-adenine pair interacts through two hydrogen bonds.
Structure of DNA and chemical bond connects the neucleotides of each strands and what type of bond holds the strands together. DNA is made up of a sugar phosphate backbone and rungs are made up of nitrogen bases and the two strands of DNA are anti parallel.Hydrogen bond holds the two strands together and an phosphodiester bond holds nucleotides together.tructure of DNA and chemical bond connects the neucleotides of each strands and what type of bond holds the strands together. DNA is made up of a sugar phosphate backbone and rungs are made up of nitrogen bases and the two strands of DNA are anti parallel.