Answer:
uracil
Step-by-step explanation:
There are four nitrogenous bases in DNA which are Thymine, Guanine, Adenine, and Cytosine, Uracil is found in RNA molecules and it helps carry out the synthesis of enzimes that help with the many functions of our body, but it is not present in a DNA molecule. The Methylation of Uracil would convert it into Thymine.