Multiple choice When DNA Polymerase III adds complimentary nucleotides the base pairing rule is: A-C and T-G A-U and C-G C-T and A-G A-T and C-G Reveal answer Fill a bubble to check yourself D Correct answer Explanation According to Chargaff's rules and the structure of DNA, Adenine (A) always pairs with Thymine (T), and Cytosine (C) always pairs with Guanine (G) via hydrogen bonds.