13. Which of the following are examples of complementary bases?
A. cytosine and guanine
B. guanine and thymine
C. thymine and cytosine
D. cytosine and adenine
14. Guanine and cytosine are held together by what type of bonds?
A. ionic bonds
B. peptide bonds
C. covalent bonds
D. hydrogen bonds
DNA molecule is T-A-G-T-C-A. what is
