Chargaff Showed That DNA That Has 30% Adenine Has ___

Question

Chargaff showed that DNA that has 30% adenine has ___ cytosine.
A) 20%
B) 30%
C) 60%
D) 40%
E) a percentage that cannot be determined of

Accepted Answer

According to Chargaff's rules, the amount of adenine (A) equals thymine (T), and the amount of cytosine (C) equals guanine (G) in DNA. If adenine is 30%, then thymine is also 30%, leaving 40% for cytosine and guanine combined. Therefore, cytosine would be 20%.