The bases in the ladder model of DNA follow a rule of complementary base pairing, where adenine always pairs with thymine and cytosine always pairs with guanine.
The rule for how the bases are arranged in the ladder model of DNA is based on complementary base pairing. In DNA, adenine (A) always pairs with thymine (T), and cytosine (C) always pairs with guanine (G). This is known as Chargaff's Rule.
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