Question

A double stranded DNA has 30% Thymine. The percentage of cytosine is

• A. 30%
• B. 70%
• C. 20%
• D. 15%

Hint:

In DNA, the base pairing rule is A = T and G = C. Use this to find the percentage of other bases when one is known.

Answer 1

The Correct Option is C

In double
stranded DNA, the amount of adenine (A) equals thymine (T), and the amount of cytosine (C) equals guanine (G). Given: Thymine = 30% ⇒ Adenine = 30% So, A + T = 60% Remaining 40% is C + G Hence, Cytosine = 20% and Guanine = 20%