DNA methylation,adding a methyl group to DNA nucleotides,in vertebrates ensures that
A)the gene functions without interruption.
B)no errors will be made during transcription.
C)the nucleosome will quickly form,which assists in mRNA formation.
D)once that gene is transcribed,the mRNA is saved and used over and over again.
E)once a gene is turned off,it will remain off.

Question

Quizplus · Accepted Answer

DNA methylation is an epigenetic modification that alters the gene expression pattern without changing the DNA sequence. In vertebrates, DNA methylation plays a critical role in gene regulation. Specifically, DNA methylation can repress gene expression by silencing transcriptionally active promoters and enhancers. Once a gene is turned off by DNA methylation, it remains off, even when the cell divides. Therefore, the best choice is E, "once a gene is turned off, it will remain off."

DNA Methylation,adding a Methyl Group to DNA Nucleotides,in Vertebrates Ensures