Erwin Chargaff studied the DNA of organisms within a single species. Chargaff discovered that the amount of adenine is about equal to the amount of thymine. Which of these explains why the ratio of adenine to thymine is nearly 1:1?
a
adenine bases contain a form of thymine
b
adenine and thymine are identical in chemical composition
c
adenine binds with phosphates, while thymine binds with nitrates
d
adenine and thymine pair with each other