Which of the following would NOT necessarily be true for a DNA molecule?

Name: Which of the following would NOT necessarily be true for a DNA molecule?
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Question

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In a DNA molecule, the amount of adenine (A) equals thymine (T) and the amount of cytosine (C) equals guanine (G), so A = T and C = G are true. Chargaff's rules state that A + G = C + T and A + C = G + T are also true. However, A + T = G + C is not necessarily true, as the proportions of A-T pairs and G-C pairs can vary.

Which of the Following Would NOT Necessarily Be True for a DNA