Question

cytosine makes up 42% of the nucleotides in a sample of dna from an organism. approximately what percentage of the nucleotides in this sample will be thymine? 8% 16% 31% 42%

Explanation:

Step1: Apply Chargaff's rule

In DNA, \(C = G\) and \(A=T\). Given \(C = 42\%\), so \(G=42\%\).

Step2: Calculate \(A + T\)

Since \(A + T+C + G=100\%\), then \(A + T=100-(42 + 42)=16\%\).

Step3: Find \(T\)

Because \(A = T\), so \(T=\frac{16\%}{2}=8\%\).

Answer:

A. \(8\%\)