Which statement is true of DNA's structure?
A. The hydrogen bonding of cytosine to guanine is an example of complementary base pairing.
B. In DNA, adenine always base pairs with guanine and cytosine always base pairs with thymine.
C. Each of the four nucleotides in a DNA molecule has the same nitrogen-containing base.
D. When adenine base pairs with thymine, they are linked by three hydrogen bonds.
E. All four bases in DNA can be found in equal quantities.
Answer: A
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