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Invisibread
Adenine pairs with Thymine and Guanine pairs with Cytosine. I remember this by the car (C) goes in the garage (G). Then A and T are the only ones left, so they pair together.
jmrodriguez379
Adenine pairs with Thymine because they have a common hydrogen bond.
Guanine and Cytosine are the other pair, don't forget.