When CpG islands are unmethylated,_________ .
A) chromatin in the promoter region is open, allowing access by transcription factors and RNA polymerase
B) genes downstream of the CpG islands cannot be expressed, because the promoter region is blocked by histones
C) chromatin in the promoter region is closed, preventing transcription factors and RNA polymerase from binding
D) DNAse hypersensitivity in that region of the chromosome is lost
E) chromatin in the enhancer region is closed, so they are unable to bind regulatory proteins to initiate transcription

Question

Quizplus · Accepted Answer

When CpG islands are unmethylated, chromatin in the promoter region is open, which facilitates access by transcription factors and RNA polymerase, thereby promoting gene expression.

When CpG Islands Are Unmethylated,_________