Final answer:
Adenine (A) binds exclusively with thymine (T) by forming two hydrogen bonds, and guanine (G) binds only with cytosine (C) by creating three hydrogen bonds, maintaining DNA's double helix structure.
Step-by-step explanation:
In the context of DNA base pairing, adenine (A) can only bind with thymine (T), forming two hydrogen bonds. Similarly, guanine (G) can only bind with cytosine (C), creating three hydrogen bonds. These specific pairings are essential to maintain the consistency and stability of the DNA double helix structure. The rules of base pairing are crucial for DNA replication and transcription processes. As an example, if a segment of DNA has the sequence ATTG, the complementary base sequence that binds to it on the other chain would be TAAC.