DNA is Methylated on Which Nucleotides

Question

DNA is methylated on which nucleotides?
A)adenine
B)uracil
C)guanine
D)thymine
E)cytosine

Accepted Answer

DNA is methylated on the cytosine nucleotide, typically on the C-5 position of the cytosine ring. Methylation of cytosine is an important epigenetic modification involved in gene regulation and genomic imprinting.