Which of the following statements is true?
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. None of these statements are true.
Answer: a
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