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DNA methylation is a unique mechanism used to silence portions of the DNA molecule.

Methylation involves the addition of a methyl ($CH_3$) group to the cytosine of CG doublets in DNA, and it is

A

an epigenetic mechanism found both in eukaryotes and prokaryotes to control gene expression.

B

an epigenetic mechanism found in prokaryotes to expose their DNA to restriction endonucleases.

C

a mechanism to enhance retroviral gene expression in a eukaryotic host.

D

a mechanism to support histone acetylation in areas of inactive gene expression.

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