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The center of the DNA molecule, the rungs of the ladder, are composed of A. phosphates only. B. nitrogenous bases only. C. phosphates and sugars. D. nitrogenous bases and sugars.

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The center of the DNA molecule, the rungs of the ladder, are composed of nitrogenous bases only.

Answer: B) or the second option.
The center of the DNA molecule, the rungs of the ladder, are composed of A. phosphates-example-1
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