In any DNA molecule, the number of guanine bases will:______.
a. always be equal to the number of adenine bases.
b. always be equal to the number of thymine bases.
c. sometimes be equal to the number of cytosine bases and will sometimes be equal to the number of adenine bases.
d. sometimes be equal to the number of thymine bases and will sometimes be equal to the number of adenine bases.
e. always be equal to the number of cytosine bases.