OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The percentage of thymine in the DNA of an organism is approximately 30 %. What is the percentage of guanine?
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70 %
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30 %
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40 %
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20 %
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Explanation:
Detailed explanation-1: -Here, [A] = 30%, therefore, % of [T] is also 30%. Thus, [G]+[C] = 100-60 = 40%. [G] = 20% and [C] = 20%. The correct answer is B.
Detailed explanation-2: -Answer: There would be 20% Cytosine. Adenine (30%) = Thymine (30%) Guanine (20%) = Cytosine (20%)
Detailed explanation-3: -Therefore if there is 30% thymine in DNA then 30% adenine would be present in the DNA which makes a total of 60%. The rest 40% is made by cytosine and guanine. So cytosine will make 20% and guanine will make 20% of nucleotide in the DNA. Therefore the correct answer is 20%.
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