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WorldlyGlass49
Their model of the DNA molecule showed that the hydrogen bonds could create a nearly perfect fit between nitrogenous bases along the center of the molecule. But the bonds could only form between adenine and thymine, and between cytosine and guanine.
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They were the first ones to build a model that showed the hydrogen bonds that could make a almost perfect fit between nitrogenous bases along the center of the molecule. This could only happen if the bonds could form between adenine and thymine, and between cytosine and guanine.