The nitrogenous base adenine is always pair with 

A.guanine         B.thymine
C.cytosine        D.uracil?

The nitrogenous base adenine is always pair with A.guanine B.thymine C.cytosine D.uracil?

The nitrogenous base adenine is always pair with A.guanine         B.thymine C.cytosine        D.uracil
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