A) \[C-A\] pair would be too wide to fit in the double helix
B) \[C\] and \[A\] are both polar
C) \[C-A\] pair would not reach across the double helix
D) The functional groups that form \[H-\]bond are not complementary between \[C\] and\[A\]
Correct Answer: D
Solution :
Adenine is complementary to thymine and guanine to cytosine. These are joined by \[H-\]bonds i.e, two between \[A=T\] and three between\[G=C\].
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