Answers

2015-11-30T20:33:58+08:00
Guanine pairs with Cytosine(GC), and Adenine pairs with up Thyamine (AT) 
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2015-12-01T19:04:01+08:00
In DNA

Adenine <--(always pair w/)--> Thymine
Cytosine <--(always pair w/)-> Guanine
3 4 3