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2. If a double stranded DNA has 20 per cent of cytosine, calculate the per cent of adenine in the DNA.
Answers (1)
By Chargaff's rule, we know that A=T and G=C. Since there are 20% cytosines, so guanines percentage will also be 20%. The G+C count is 20+20= 40%. Therefore, the remaining 60% will be contributed equally by adenine and thymine. Thus, the percentage of adenine and thymine are 30% each.
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