Practice question
Question
If the total amount of adenine and thymine in a double-stranded DNA is 45%, the amount of guanine in this DNA will be:
Explanation
According to Chargaff, A pairs with T and G pairs with C equally in duplex DNA. If A+T equals 45 percent, then G+C equals 55 percent. Since G equals C proportion, guanine equals 27.5 percent, maintaining base composition parity.
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