OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Cytosine makes up 42% of the nucleotides in a sample of DNA from an organism. Approximately what percentage of the nucleotides in this sample will be thymine?
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8%
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16%
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31%
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42%
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Explanation:
Detailed explanation-1: -It is given that the total amount of thymine and adenine is = 45%, then the total amount of Guanine and cytosine will be equal to 100%-45% = 55%. Also, % G = % C, Therefore-%G =% C = 55 %/2 = 27.5 %. So, the percentage of Guanine in DNA will be equal to 27.5 %. Hence, the correct option is (B), 27.5%.
Detailed explanation-2: -The correct answer is 40%. In DNA, adenine (A) always bonds with thymine (T), while guanine (G) always bonds with cytosine (C). So, the percentages of A and T will be equal, while the percentages of G and C would also be equal.
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