Methylation is

A) short-term modification of gene expression.
B) long-term modification of gene expression.
C) the addition of methane groups to an enhancer.
D) the uncoiling of DNA, making transcription easier.

Methylation

Methylation is the process by which methyl groups are added to certain nucleotides. Methylation is associated with altered gene expression, thereby reducing or eliminating the production of proteins or RNA molecules.

Gene Expression

The process by which information from a gene is used in the synthesis of a functional gene product, often a protein.

Methane Groups

Collections of organisms, typically microbes, involved in the production or consumption of methane, a potent greenhouse gas.