5-Methylcytosine is a modified nucleobase formed by the enzymatic addition of a methyl group to the 5th carbon of cytosine. This modification is involved in epigenetic regulation, gene silencing, and ...

Both uracil and thymine pair with adenine, but they differ in their chemical structure. Thymine has an additional methyl group (-CH3) attached to its pyrimidine ring, while uracil lacks this group.