The specific base pairing rule that determines the sequence of a complementary strand of DNA from a given DNA strand is known as Chargaff's rule or complementary base pairing. According to this rule, in a DNA molecule, the amount of adenine A always pairs with thymine T , and the amount of cytosine C always pairs with guanine G . This is due to the specific hydrogen bonding between these bases.The hydrogen bonds formed between the base pairs are as follows:1. Adenine A forms two hydrogen bonds with Thymine T .2. Cytosine C forms three hydrogen bonds with Guanine G .These specific hydrogen bonds provide stability to the DNA double helix structure and ensure accurate replication and transcription processes. When synthesizing a complementary strand of DNA from a given DNA strand, the nucleotides on the new strand will follow the base pairing rule: A pairs with T, and C pairs with G. For example, if the original DNA strand has the sequence 5'-ATCG-3', the complementary strand will have the sequence 5'-TAGC-3'.