Question

Percentage of (G + C) is

• A. $\frac{G+C}{A+T+G+C}\times 100$
• B. $\frac{100}{A+T}\times G+C$
• C. $\frac{G+C}{A+T+G+C}$
• D. $\frac{(G+C)\times (A+T)}{100}$

Answer 1

The correct option is A $\frac{G+C}{A+T+G+C}\times 100$

According to Chargaff's rule, the ratios between adenine and thymine and guanine and cytosine are constant and equals one for a double stranded DNA.
Hence,
$(G+C)\%=\frac{G+C}{A+T+G+C}\times 100$