Question

If in a given sample of DNA combined proportion of AT base pairs is 30%, what will be proportion of guanine alone
A) 70%
C) 35%
B) 30%
D) Cannot find out​

Answer 1

Answer:

Explanation:

the proportion of guanine alone is 35%

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Answer 2

Answer:

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Explanation:

According to the Chargaff's rules, the DNA has 1:1 ratio of purine bases (cytosine and thymine) and pyrimidine bases (guanine and adenine). This is called as the base pair rules. It means the amount of guanine will be equal to cytosine and the amount of adenine will be equal to thymine. In the given problem, adenine is 20%. Hence, thymine will be 20%. So the percentage of cytosine and guanine will be 30% each.

Thus, the correct answer is option B.