Which of the following nitrogenous bases pairs with adenine (A) in DNA?

In DNA, adenine (A) specifically pairs with thymine (T) through the formation of two hydrogen bonds. This is a fundamental aspect of the base pairing rules in nucleic acids, which ensure the consistent structure of DNA. The complementarity of these bases is crucial for the stability of the DNA double helix and for accurate replication during cell division.

It is important to note that while guanine pairs with cytosine in DNA, these base pairs do not interact with adenine. Uracil is a nitrogenous base found in RNA but not in DNA, making it irrelevant in the context of DNA base pairing. Understanding the specific pairings in DNA helps clarify the molecular mechanisms underlying genetic encoding and expression.