OBJECTIVE LIFE SCIENCE
APPLIED BIOTECHNOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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If there is 30% cytosine in DNA how much guanine would be in the cell?
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60% guanine
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70% guanine
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30% guanine
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25% guanine
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Explanation:
Detailed explanation-1: -The percentage of guanine is 20%. A = T, G =C. Q.
Detailed explanation-2: -In a typical DNA molecule, the proportion of thymine is 30% of the N bases.
Detailed explanation-3: -This is based on the pairing rules from Chargaff’s. 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%.
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