Question

question 8 (1 point)
listen
if a species contains 30% a in its dna, what is the percentage of guanine it would contain?
a) 30%
b) 45%
c) 30%
d) 40%
e) 20%

Explanation:

Step1: Recall Chargaff's rules

In DNA, \(A = T\) and \(G = C\), and \(A+T + G + C=100\%\)

Step2: Find the percentage of \(T\)

Since \(A = 30\%\), then \(T=30\%\) (because \(A = T\))

Step3: Calculate the sum of \(A\) and \(T\)

\(A + T=30\%+30\% = 60\%\)

Step4: Find the sum of \(G\) and \(C\)

\(G + C=100\%-(A + T)=100\% - 60\%=40\%\)

Step5: Determine the percentage of \(G\)

Since \(G = C\), then \(G=\frac{G + C}{2}=\frac{40\%}{2}=20\%\)

Answer:

E. 20%