2 Answers

WRAR · Answer 1 · 2021-10-01T23:47:21+0000

Answer:

$\boxed {\boxed {\sf C=5\%}}$

Step-by-step explanation:

There is a method to calculating base percentages known as Chargaff's Rule. It states:

$A+T+G+C=100\%$

We know the DNA has 45% Adenine or A.

Adenine always pairs equally with Thymine. In other words, the percentage of adenine equals the percentage of thymine (45% Thymine or T).

$45\%+45\%+C+G=100\%$

$90\%+C+G=100\%$

Subtract 90% from both sides.

$90\%-90\%+C+G=100\%-90\%$

$C+G=10\%$

Cytosine(C) and Guanine(G) pair equally and their percentages will be equal. We can divide 10% by 2.

$C+G=10\% /2$

$C/G=5\%$

The percentage of Cytosine or C is 5 percent.

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