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Why does adenine always pair with thymine and guanine always pair with cytosine? What two factors determine the base pairing rule?

a, b, c, or d?

Why does adenine always pair with thymine and guanine always pair with cytosine? What-example-1
User Rob Holmes
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2 Answers

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I would say the answer is D.
User Dinuka Thilanga
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certain hydrogen bonds are formed so that A goes with T and G with C

User Thomas Escolan
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