When in Dna does adenine pair with guanine and cytosine pair with thymine?

Adenine connects to thymine and guanine connects to cytosine; these are the only pairs possible (adenine does not connect to guanine nor does cytosine connect to thymine). So, the answer is "never." More.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.