Question

question 9 (1 point)
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if a dna molecule contains 13% cytosine,
what % of adenine is in the molecule?
26%
37%
74%
13%

Explanation:

Step1: Recall base - pairing rules

In DNA, \(C = G\) (cytosine pairs with guanine) and \(A=T\) (adenine pairs with thymine). Given \(C = 13\%\), then \(G=13\%\).

Step2: Calculate the sum of \(A\) and \(T\)

The sum of all bases is \(100\%\). So \(A + T=100-(C + G)=100-(13 + 13)=74\%\).

Step3: Find the percentage of \(A\)

Since \(A = T\), then \(A=\frac{74}{2}=37\%\).

Answer:

37%