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Question

If a double stranded DNA has 35% thymine, what would be the percentage of guanine in the DNA.

A
35%
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B
70%
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C
30%
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D
15%
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Solution

The correct option is D 15%
According to Chargaff's rule,

A=T and G=C.

The percent composition of thymine according to the question is 35%.

Adenine=Thymine=35%

(%Adenine+%Thymine) + (%Cytosine+%Guanine) = 100%

(35+35) + (C+G) = 100%

(C+G)= 30%

Since C=G,

C=G=15%

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