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Thirty percent of the bases in a sample of DNA extracted from eukaryotic cells is adenine. What percentage of cytosine is present in this DNA?
- a)10%
- b)20%
- c)30%
- d)40%
Correct answer is option 'B'. Can you explain this answer?
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Thirty percent of the bases in a sample of DNA extracted from eukaryot...
Calculation of Cytosine Percentage in DNA
To determine the percentage of cytosine in the DNA sample, we first need to understand the complementary base pairing in DNA. Adenine always pairs with thymine, and cytosine always pairs with guanine. Therefore, if adenine makes up 30% of the bases, thymine must also make up 30% (since they pair with each other).
Complementary Base Pairing
- Adenine (A) = Thymine (T)
- Cytosine (C) = Guanine (G)
Calculation
Since adenine and thymine together make up 60% of the bases (30% each), the remaining 40% must be divided between cytosine and guanine. Since cytosine and guanine always pair with each other, they must be equal in percentage.
Therefore, the percentage of cytosine in the DNA sample is 20% (half of the remaining 40%).
Therefore, the correct answer is option B) 20%.
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Thirty percent of the bases in a sample of DNA extracted from eukaryot...
If 30 percent of DNA is adenine, then by Chargaff’s rule 30 percent will be thymine. The remaining 40 percent of the DNA is cytosine and guanine. Since the ratio of cytosine to guanine must be equal, then each accounts for 20 percent of the bases.
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Thirty percent of the bases in a sample of DNA extracted from eukaryotic cells is adenine. What percentage of cytosine is present in this DNA?a)10%b)20%c)30%d)40%Correct answer is option 'B'. Can you explain this answer?
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