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OpenStudy (anonymous):

why A pair with T, and G pair with C only??????

OpenStudy (anonymous):

because A G are purine and T C are pyrimidine and purine and pyrimidine are complementary to each other A pair with t and G pair with C becoz of der configuration ...

OpenStudy (trancenova):

Yep that's basically it, their respective structures means that they fit together nicely. See the pictures for their structure and how they fit together :) (piccys from http://www.chemguide.co.uk/organicprops/aminoacids/dna1.html)

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