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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
