How Does Methylation Regulate Transcription

Question

How does methylation regulate transcription?
A) via the addition of a methyl group to cysteine bases of DNA
B) via the addition of a methyl group to cysteine residues on RNA polymerase II
C) via the addition of a methyl group to cytosine residues on RNA polymerase II
D) via the addition of a methyl group to cytosine bases of DNA

Accepted Answer

Methylation regulates transcription primarily through the addition of methyl groups to cytosine bases of DNA, which can alter gene expression by affecting the binding of transcription factors or changing the structure of DNA.