Which base pairs are found in DNA?

The base pairs found in DNA are adenine (A) paired with thymine (T) and cytosine (C) paired with guanine (G). This pairing follows Chargaff's rules, which state that the amount of adenine should equal thymine, and the amount of cytosine should equal guanine in a double-stranded DNA molecule. This specific pairing is critical for the structure and replication of DNA, as it ensures the stability of the double helix and allows for accurate copying during cell division. The hydrogen bonds that form between these specific bases maintain the integrity of the genetic code.

In contrast, other combinations listed do not represent the correct base pairing in DNA, as they either mix the bases incorrectly or suggest pairings that do not exist in natural DNA structures. Understanding this correct pairing is fundamental for studying genetics, molecular biology, and related fields.