Question

In a DNA, percentage of thymine is 20. What is the percentage of Guanine?

• A. 20%
• B. 30%
• C. 40%
• D. 60%

Hint:

In DNA, the base pairing rule (A=T, G=C) ensures that the percentages of complementary bases are equal.

Answer 1

The Correct Option is B

In DNA, adenine (A) pairs with thymine (T), and guanine (G) pairs with cytosine (C). If thymine is 20%, adenine must also be 20%. Together, A+T = 40%, so G+C = 60%. Since G and C are equal, G = 30% and C = 30%.