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the two complementary strands of DNA are held together by

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The two complementary strands of DNA are held together by Hydrogen bonding. 
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DNA strand and its complementary strand are held together by hydrogen bonds. A "G" (guanine) base on one strand will always be bonded to a "C" (cytosine) on the opposite strand by 3 hydrogen bonds. An "A" (adenine) base on one strand will always be bonded to a "T" (thymine) on the opposite strand by 2 hydrogen bonds.
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