5) what is true about the relationship of adenine and thymine?
a) adenine and thymine are a base pair.
b) adenine and thymine are antiparallel.
c) adenine and thymine form a covalent bond.
d) adenine and thymine are phosphates.

6) which of the following discoveries provided a critical clue watson and crick in solving the structure of dna
a) the hershey-chase experiment
b) griffith's transformation experiment
c) chargaff's base ratios
d) miescher's isolation of dna

10) describe how nucleotides and hydrogen bonds affect the structure of dna.