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Here are four individual strands of dna: 1- 5'aattccggcctaactt3' 2- 5'aagttaggccggaatt3' 3- 5'ttaaggccggattgaa3' 4- 5'ttcaatccggccttaa3' which strands would pair with one another?

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danilosanmartin
In the context of DNA strand pairing, there is a specific pairing sequence. Adenine (A) will always pair with thymine (T); cytosine (C) will always pair with guanine (G). One strand goes from 5' to 3' and the pair strand goes from 3' to 5'. In this case, 1 and 2 pairs with each other as well as 3 and 4.

5'-AATTCCGGCCTAACTT-3' is paired to 5'-AAGTTAGGCCGGAATT-3' 
5'-TTAAGGCCGGATTGAA-3'  is paired to 5'-TTCAATCCGGCCTTAA-3' 

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