Which of the following statements is true of DNA methylation?
A) It usually silences the expression of a gene.
B) It usually increases the expression of a gene.
C) It usually deletes the promoter sequence of DNA.
D) It usually adds extra nucleotides to a sequence of DNA.

Question

Quizplus · Accepted Answer

DNA methylation usually involves the addition of a methyl group to a cytosine base in the DNA sequence, which can result in the silencing (or decreased expression) of a gene. It does not typically increase gene expression, delete promoter sequences, or add extra nucleotides.

Which of the Following Statements Is True of DNA Methylation