Which nitrogen bases pair together in DNA?

In DNA, the pairing of nitrogen bases occurs through specific interactions that are crucial for the structure of the DNA double helix and the encoding of genetic information. Adenine pairs exclusively with Thymine, forming two hydrogen bonds between them. This pairing is essential for maintaining the stability of the DNA structure. Similarly, Guanine pairs with Cytosine, which is slightly more complex as it forms three hydrogen bonds. This difference in bonding strength contributes to the overall stability of the DNA molecule.

The options that suggest incorrect pairings either swap these pairs or introduce bases not found in DNA, such as Uracil, which is only present in RNA. Therefore, understanding these base pair relationships is fundamental for grasping concepts in genetics and molecular biology, as they illustrate how genetic information is accurately copied and passed to future generations.