Question

6 In a DNA percentage of thymine is 20% then what is the percentage of guanine

• A. 20%
• B. 40%
• C. 30%
• D. 60%

Answer 1

Answer: (C)

30%

Answer 2

The correct option is (C) : 30%

The DNA molecule should have an equal amount of pyrimidine (cytosine and thymine) and purine (adenine and guanine), according to Chargaff's rule. The number of adenine molecules is equivalent to the number of thymine molecules, and the number of guanine molecules is equivalent to the number of cytosine molecules. A = T, T = G, and C = C According to the legislation, dsDNA must also have 20% guanine if it has 20% cytosine. Therefore, the G + C component proportion is 40%. Both A and T molecules are present in the remaining 60%. The proportion of adenine molecules is 30% since adenine and guanine are both present in equal amounts at all times. The right response is thus "30%."