Question

according to chargaffs rule, if a dna sequence contains 20% adenine, what percentage of its structure will be cytosine? 20% 30% 80% 50% rewatch

Explanation:

Step1: Determine the percentage of Thymine

According to Chargaff's Rule, \(A = T\). Given \(A = 20\%\), so \(T=20\%\).

Step2: Calculate the combined percentage of \(G + C\)

Since \(A + T+G + C = 100\%\), substituting \(A = 20\%\) and \(T = 20\%\), we get \(G + C=100-(20 + 20)=60\%\).

Step3: Find the percentage of \(C\)

Also, by Chargaff's Rule \(G = C\). So \(C=\frac{G + C}{2}\). Substituting \(G + C = 60\%\), we have \(C=\frac{60}{2}=30\%\).

Answer:

30%