PATHOLOGY MCQ
GENETICS AND DISEASE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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20%
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60%
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70%
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30%
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Detailed explanation-1: -According to Chargaff’s rule, if adenine makes up 30% of DNA, then thymine will make up 30%. Cytosine and guanine make up the remaining 40% of DNA. Each makes up 20% of the bases since the ratio of cytosine to guanine must be equal. So, the correct answer is option B, 20%.
Detailed explanation-2: -Since the percentage of adenine is comparable to thymine, that means the DNA sample will have 30% of thymine. With 60% of the nucleotides being A or T, that leaves 40% for cytosine and guanine. Therefore the amount of guanine will be 20% and cytosine will be 20%.
Detailed explanation-3: -Expert-Verified Answer If there is 30% cytosine which means guanine percentage is also 30%. A+T = 100-60 =40, Adenine percent= 40/2= 20.