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Nucleotides and Nucleosides

What would be...

Question

What would be the percentage of thymine in a double stranded DNA sample, which contains 20% cytosine of the total bases?

A

10%

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B

20%

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C

30%

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D

40%

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Solution

The correct option is C 30%
According to Chargaff's rule:
Guanine (purine) = Cytosine (pyrimidine) and
Adenine (purine) = Thymine (pyrimidine)
Therefore, Guanine would be 20% and total of G+C = 40% and hence A+T would be 60% that is 30% each. Hence, option C is correct answer.

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