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.