In DNA base pairing, which of the following pairs is correct?

In DNA base pairing, the correct pairing is based on specific interactions between nitrogenous bases. The pairing rules indicate that adenine (A) pairs with thymine (T) through two hydrogen bonds, and cytosine (C) pairs with guanine (G) through three hydrogen bonds.

This complementary base pairing is a key feature of DNA structure, providing a stable mechanism for the replication of genetic information. In the option that identifies A as pairing with T and C as pairing with G, both relations align perfectly with these established pairing rules, demonstrating the fundamental chemistry behind the double-helix structure of DNA.

The other options do not accurately reflect the base pairing rules in DNA. For instance, A cannot pair with C or U, and T does not pair with G. These inaccuracies highlight the importance of understanding the specific pairings to grasp DNA function and biology.