18. The higher the ____ content of a DNA, the ____ the melting temperature, and the ____ the ionic strength, the ____ the melting temperature.
(A) G:C; higher; lower; lower
(B) G:C; lower; higher; lower
(C) G:C; higher; higher; lower
(D) A:T; higher; higher; lower
(E) A:T; lower; lower; higher

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