OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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If a DNA molecule is 18% Guanine which of the following is correct
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18% cytosine, 32% adenine, 32% thymine
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32% cytosine, 18% adenine, 32% thymine
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18% cytosine, 64% adenine, 64% thymine
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32% cytosine, 32% adenine, 18% thymine
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Explanation:
Detailed explanation-1: -According to Chargaff’s rule in a DNA molecule A = T and G = C and A + G + C + T = 100%. Here cytosine (C) is 18% hence G = 18% ∴ A + T = (100 – 36)% ∴ A + T = 64% ∴ A = 32%
Detailed explanation-2: -The percentage of guanine is 20%.
Detailed explanation-3: -Since cytosine and guanine are present in equal amounts, we can simply divide their sum by 2. The final composition is 22% adenine, 22% thymine, 28% cytosine, and 28% guanine.
There is 1 question to complete.