Final answer:
The base pairing law in DNA specifies that adenine (A) pairs with thymine (T) and guanine (G) pairs with cytosine (C), forming complementary base pairs that preserve genetic information during cell division.
Step-by-step explanation:
The base pairing law in DNA states that specific nitrogenous bases pair together due to hydrogen bonding, adhering to a strict pattern. Adenine (A) pairs with thymine (T), and guanine (G) pairs with cytosine (C). These pairs are known as complementary base pairs.
The incorrect option is "G pairs with A," which contradicts the established rule that A pairs with T, while G pairs with C. These base pairs are crucial in the preservation of genetic information during cell division and DNA replication. Adenine and thymine are connected by two hydrogen bonds, whereas cytosine and guanine are connected by three hydrogen bonds, providing stability to the DNA helix structure.