Gujarati
Hindi
5.Molecular Basis of Inheritance
medium

Thirty percent of the bases in a sample of $DNA$ extracted from eukaryotic cells is adenine. What percentage of cytosine is present in this $DNA$ ?

A

$10\%$

B

$20\%$

C

$30\%$

D

$40\%$

(AIIMS-2015)

Solution

If $30$ percent of $DNA$ is adenine, then by Chargaff’s rule $30$ percent will be thymine. The remaining $40$ percent of the $DNA$ is cytosine and guanine. Since the ratio of cytosine to guanine must be equal, then each accounts for $20$ percent of the bases.

Standard 12
Biology

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