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CBSE Class 12-science Answered

A double-stranded DNA has 20% of cytosine. Calculate the percent of adenine in the DNA. Explain. 
Asked by Topperlearning User | 16 Jun, 2014, 04:40: PM
answered-by-expert Expert Answer

In a DNA molecule, the number of cytosine molecules is equal to guanine molecules and the number of adenine molecules is equal to thymine molecules. Thus, if a double-stranded DNA has 20% cytosine, it has 20% guanine. Thus, C + G makes 40% of the total bases. The remaining 60% includes both adenine and thymine which are in equal amounts. So, the percentage of adenine is 30%.

Answered by | 16 Jun, 2014, 06:40: PM
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