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Where are the hydrogen bonds found in this DNA molecule? Solid lines represent strong bonds formed when electrons are shared by two atoms. Dotted lines represent a weak bond formed by an attraction between two atoms that do not share electrons. H,C O Adenine 0-P=0 H. Thymine Sugar-phosphate backbone Cytosine Guanine 0-P=0 N--H Sugar-phosphate backbone Nitrogenous bases between H in thymine and N in adenine between H in cytosine and O in guanine between N and H in the nucleotide containing guanine between C and H in the nucleotide cytosine