True about DNA methylation: (A) Alters gene expression, (B) Genetic code remains intact, (C) Role in Carcinogenesis, (D) Protective mechanism against cleavage by restriction endonuclease
Answer is A. DNA methylation is an epigenetic mechanism used by cells to control gene expression. A number of mechanisms exist to control gene expression in eukaryotes, but DNA methylation is a commonly used epigenetic signaling tool that can fix genes in the "off" position.Methylation epigenetically modifies the function of the DNA. When located in a gene promoter, DNA methylation typically acts to repress gene transcription.