Thirty percent of the bases in a sample of $DNA$ extracted from eukaryotic cells is adenine. What percentage of cytosine is present in this $DNA$ ?
AIIMS 2015, Medium
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b
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.
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.
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