form backbone nucleic acid sequence nitrogenous bases stores information common nitrogenous bases adenine cytosine guanine thymine uracil nitrogenous bases strand nucleic acid form hydrogen bonds certain nitrogenous bases complementary strand nucleic acid similar zipper adenine binds thymine uracil thymine binds adenine cytosine guanine bind one another adenine thymine adenine uracil contains two hydrogen bonds hydrogen bonds formed cytosine
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