In Eukaryotic DNA Methylation,methyl Groups are Usually Added to Which

Question

In eukaryotic DNA methylation,methyl groups are usually added to which molecule?  
A) Guanine
B) Thymine
C) Adenine
D) Cytosine
E) Deoxyribose

Accepted Answer

In eukaryotic DNA methylation, methyl groups are usually added to the cytosine base of the DNA molecule, specifically in the context of CpG dinucleotides. This can regulate gene expression and contribute to the epigenetic control of cellular processes.