Question

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

Answer 1

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%.