OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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If 20% of a DNA sample is made up of thymine, T, what percentage of the sample is made up of cytosine, C?
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15%
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30%
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35%
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50%
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Explanation:
Detailed explanation-1: -Answer and Explanation: The correct answer is c. The percentage of adenine and thymine are always the same, which means that 20% plus 20% = 40%. Since 40% of the DNA is made up of adenine-thymine pairs, that leaves 60% of the DNA remaining as cytosine-guanine pairs.
Detailed explanation-2: -Answer: There would be 20% Cytosine. Adenine (30%) = Thymine (30%)
Detailed explanation-3: -Thus, If a double stranded DNA has 20% of cytosine, it has 20% of guanine. Thus, cytosine plus guanine make 40% of the total bases. The remaining 60% includes both adenine and thymine which are in equal amounts. Therefore, the percent of adenine is 30%.
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