When a DNA promoter sequence is methylated, ____
a. it is permanently silenced because the methyl group can never be removed
b. it is temporarily silenced because the methyl group can be removed
c. it is perpetually transcribed because the methyl group can never be removed
d. it is temporarily transcribed because the methyl group can be removed
e. the impact on expression depends on the gene being controlled by the promoter
ANSWER: b
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