We bet you've heard about DNA, the molecule that stores our genetic information. Do you typically associate DNA with keto-enol tautomerization? You should! DNA consists of a sugar-phosphate backbone and four nucleotide bases: adenine (A), guanine (G). thymine (T) and cytosine (C). The amides in T and G can exist in either of two tautomeric forms. Which two structures represent keto-like tautomers? Guanine Thymine HN H, N ON HNa. A&C b. A&D c. .B &c