AIIMS 2018 Chemistry DNA Structure MCQ Question

Chargaff's rule states that in a double-stranded DNA molecule, the amount of adenine (A) is equal to that of thymine (T), and the amount of guanine (G) is equal to that of cytosine (C). This complementary base pairing is crucial for the structure of DNA, ensuring stability and accurate replication. Option A is incorrect because it incorrectly pairs adenine with guanine, while option B misstates the relationships between adenine, cytosine, thymine, and guanine. Option D is also incorrect as it suggests that all bases are present in equal amounts, which is not the case in most organisms.