DNA methylation may be a significant mode of genetic regulation in eukaryotes. Methylation refers to _.
A) changes in DNA -DNA hydrogen binding
B) alteration of DNA polymerase activity by addition of methyl groups to glycine residues
C) altering translational activity, especially of highly methylated tRNAs
D) addition of methyl groups to the cytosine of CG doublets
E) altering RNA polymerase activity by methylation

Question

Quizplus · Accepted Answer

DNA methylation involves the addition of methyl groups to the cytosine bases in CG dinucleotides, affecting gene expression.

DNA Methylation May Be a Significant Mode of Genetic Regulation