Molecular Basis Of Inheritance Question 127

Question: If a double stranded DNA has 20% of cytosine, what will be the percentage of adenine in it?

Options:

A) 20%

B) 40%

C) 30%

D) 60%

Show Answer

Answer:

Correct Answer: C

Solution:

[c] The purines and pyrimidines are always in equal amounts as per chargaff?s rule.

So, if cytosine is 20%, the thymine will be 30% and thymine is equal to adenine.

Then the percentage of adenine will be 30%.