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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 A. phosphates only. B. nitrogenous bases only. C. phosphates and sugars. D. nitrogenous bases and sugars.

User Akira Fukushima
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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
User Damir
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