November 1 2016 Scientists and engineers make use of the rules of Watson-Crick base-pairing to create DNA systems that have the possibility to do computations and identify disease. Adenine Thymine Cytosine Guanine GC AT A and G are purines doublering C and T are pyrimidines singlering DNA to mRNA Possible Bases. A Mnemonic Device To Remember The Dna Bases A Goes With T C Goes With G Nursing School Survival Teaching Biology Teaching Science The 4 DNA Bases and Their Strict Pairing Rules The DNA of all the living beings is composed of just four bases ie. . The fundamental rule is the fact that Adenine binds to Thymine and Cytosine binds to Guanine developing base-pairs through hydrogen connecting. What is the base pairing rule for Dna. According Chargaffs rule for base pairing-. Chargaffs rule also known as the complementary base pairing rule states that DNA base pairs are always adenine with thymine A-T and cytosine with gu