If an organism's DNA contains 20% adenine nucleotides, what percentage of its DNA is composed of guanine nucleotides?
A) 10%
B) 15%
C) 20%
D) 30%
E) 40% Since 20% of the organism's DNA consists of adenine nucleotides, 20% consists of thymine nucleotides. The other 60% consists of guanine and cytosine. Since the amount of G=C, the DNA is 30% guanine and 30% cytosine.
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