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Which of the following statements about the structure of double-stranded DNA is correct? Select ALL that apply.
Nucleotides within a DNA strand are held together by hydrogen bonds.
DNA has an overall net positive charge.
Bases in complementary strands of DNA are held together by covalent bonds.
The 5' end of a DNA strand has a free hydroxyl group.
Base pair formation occurs between a single-ringed pyrimidine and a double-ringed purine.
New nucleotides are added to the 3' end of a growing strand of DNA.