Which of the following is true about the structure of DNA?
A. Adjacent nucleotides are stacked on top of each other, one base pair every 0.34 nm.
B. Purine and pyrimidine bases are attached to the 1'-carbon of the deoxyribose sugars.
C. Nucleotides are joined by phosphodiester bonds.
D. All of the choices are correct.
Answer: D
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