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  3. Chemistry
  4. 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?

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Q. 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?

BITSATBITSAT 2018

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.