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1:19
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Stephanie Castle
3.3.4 Explain how a DNA double helix is formed
3.3.4 Explain how a DNA double helix is formed using complementary base pairing and hydrogen bonds. Nitrogenous bases from two single strands are joined using the complimentary base pairing rule. Adenine with Thymine (using two hydrogen bonds) and Cytosine with Guanine (using three hydrogen bonds). A DNA double helix is formed firstly when a ...
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