If 20% of nucleotides in the DNA of a particular organism contain thymine,estimate the percentage of cytosine that is present in the DNA.

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Quizplus · Accepted Answer

30%In a DNA molecule, the amount of adenine (A) equals the amount of thymine (T), and the amount of guanine (G) equals the amount of cytosine (C). Given that 20% of nucleotides contain thymine, adenine also makes up 20% of the nucleotides. This accounts for 40% of the DNA, leaving 60% for cytosine and guanine combined. Since cytosine and guanine are present in equal amounts, cytosine makes up half of the remaining 60%, which is 30%.

If 20% of Nucleotides in the DNA of a Particular