If a double stranded DNA has 20 per cent of cytosine, calculate
the per cent of adenine in the DNA.
rule, the DNA molecule should have an equal ratio of pyrimidine
(cytosine and thymine) and purine (adenine and guanine). It means
that the number of adenine molecules is equal to thymine
molecules and the number of guanine molecules is equal to
% A = % T and % G = % C
If dsDNA has 20% of cytosine, then according to the law, it would
have 20% of guanine.
Thus, percentage of G + C content = 40%
The remaining 60% represents both A + T molecule. Since adenine
and guanine are always present in equal numbers, the percentage
of adenine molecule is 30%.
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