OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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According to Chargaff’s rules, if DNA of a species contains 20% thymine, what percent of guanine will it contain?
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20%
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30%
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40%
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80%
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Explanation:
Detailed explanation-1: -The remaining 60% represents both G + C molecule. Since cytosine and guanine are always present in equal numbers, the percentage of guanine molecule is 30%.
Detailed explanation-2: -According to Chargaff’s rule, in DNA, the proportion of adenine always equals to that of thymine and proportion of guanine always equals to that of cytosine, i.e. A=T and G=C. Thus, in the DNA of an organism, if guanine is 20% cytosine also will be 20%.
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