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