Methylation regulates transcription by ____
a. adding a methyl group to cytosine bases of DNA
b. adding a methyl group to cysteine residues on RNA polymerase II
c. adding a methyl group to cysteine bases of DNA
d. adding a methyl group to cytosine residues on RNA polymerase II
e. interfering with the chromatin remodeling process
ANSWER: a
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