Question Detail
Question
For double-stranded DNA which of the following base ratios will always equal to 1?
Correct Answer
Option D is the correct answer.
Detailed Explanation
According to Chargaff's rules, in double-stranded DNA, the number of adenine (A) equals the number of thymine (T), and the number of guanine (G) equals the number of cytosine (C). Therefore, A+G (purines) always equals C+T (pyrimidines). So the ratio (A+G)/(C+T) always equals 1.
Hint
Which groups of bases always pair with each other? Purines (A,G) pair with Pyrimidines (T,C).