PDF DNA Base Pairing Worksheet - MS. AU'S WEBSITE DNA Base Pairing Worksheet There are base pairing rules for writing complimentary DNA strands for a given strand. • In DNA, o Adenine pairs with Thymine o Cytosine pairs with Guanine • In RNA, Adenine pairs with Uracil, instead of Thymine • DNA → mRNA → amino acid carried by tRNA • Note: the codon chart refers to the mRNA sequence. 1.