In vertebrates,DNA methylation - the addition of a methyl group to DNA nucleotides - 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 plays a crucial role in regulating gene expression. Once a gene is methylated and turned off, it will remain off as the presence of methyl groups inhibits the binding of transcription factors and other proteins necessary for gene expression. This ensures that certain genes are only expressed when needed, and helps establish cell differentiation and specialization.

In Vertebrates,DNA Methylation - the Addition of a Methyl Group