BIOLOGY
NUCLEIC ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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If there is 23% Guanine in a DNA molecule, how much Cytosine exists in the same molecule?
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23%
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46%
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54%
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27%
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0%
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Explanation:
Detailed explanation-1: -The correct answer choice is b. If the DNA of a species has 23% cytosine, there also will be 23% of the complementary base, guanine. Thymine and its complementary base, adenine, will each make up 27%.
Detailed explanation-2: -Therefore the base percentage of GC is 54% in the whole DNA sequence.
Detailed explanation-3: -So, the correct option is ‘27%’.
Detailed explanation-4: -DNA bases bond in pairs with Thymine to Adenine and Guanine to Cytosine. For every one Thymine there will be one Adenine. So, 23% Thymine would mean that there is also 23% Guanine. Guanine would equal 54%/2 or 27%.
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