If a strand of DNA is composed of 17% guanine and 23% thymine, what percentage of the complementary strand would contain adenine? A. 17 B. 23 C. 27 D. 40

To solve this problem, we need to understand the base pairing rules in DNA. In DNA, adenine (A) pairs with thymine (T), and guanine (G) pairs with cytosine (C).<br /><br />Given information:<br />- The DNA strand contains 17% guanine (G) and 23% thymine (T).<br /><br />Since the complementary strand will have the same percentage of bases, the complementary strand will also contain 17% guanine (G) and 23% thymine (T).<br /><br />Now, we need to find the percentage of adenine (A) in the complementary strand.<br /><br />Since adenine (A) pairs with thymine (T), the percentage of adenine (A) in the complementary strand will be the same as the percentage of thymine (T) in the original strand.<br /><br />Therefore, the percentage of adenine (A) in the complementary strand is 23%.<br /><br />The correct answer is B. 23.