Which statement is true?
a. The hydrogen bonding of cytosine to guanine is an example of complementary base
pairing.
b. Adenine always pairs up with guanine in DNA, and cytosine always teams up 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. In the DNA of all species, the amount of cytosine never equals the amount of guanine.
A
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