Which nitrogenous base percentage is complementary to the 22% guanine found in a double-stranded dna molecule? a. 44% adenineb. 22% cytosinec. 22% thymined. 48% thymine

22% cytosine, because each pair has an equal amount of complementary base percentages. For example, if you are given 20% Adenine, then there has to be 20% Thymine as well, and you can also calculate cytosine and guanine by looking at the remaining percentage (80%). Because 80% is left over and each complementary base pair has equal amounts of base percentages, Cytosine and Guanine would each have 40%.

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C) to ensure each new cell has an exact copy of the dna