The two strands of a double helix model of $DNA$ are held together by hydrogen bonds between
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d The two strands of a double helix model of $DNA$ are held together by hydrogen bonds between nitrogenous bases which help to stabilize the interaction. Adenine - thymine pair has two hydrogen bonds while guanine - cytosine pair has three hydrogen bonds.
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In sea urchin $DNA$, which is double stranded, $17\%$ of the bases were shown to be cytosine.The percentages of the other three basesexpected to be present in this $DNA$ are