DNA methylation is an alternative to histone modification for the regulation of gene expression. The usual target of this methylation process is cytosine.
Methylation of DNA involves the addition of a methyl group to nucleotide bases. Which of the following does not apply?
A. Methylation of cytosine forms methyl-cytosine.
B. Methylation affects the three-dimensional structure of DNA.
C. Methylation has no effect on the structure of DNA.
D. Methylation affects gene expression.
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