Chromatin Remodeling Refers to the Process by Which

Question

Chromatin remodeling refers to the process by which:
A)nucleosomes are repositioned to expose different stretches of DNA to the nuclear environment.
B)DNA strands are "straightened out" to allow access to the proteins that carry out transcription.
C)DNA strands are "unzipped" to allow access to the proteins that carry out transcription.
D)methylation occurs in CpG islands.
E)mutations change DNA structure and therefore chromatin structure.

Accepted Answer

Chromatin remodeling involves the repositioning of nucleosomes to expose different stretches of DNA to the nuclear environment, which can affect gene expression. This can involve changes in the acetylation or methylation of histone proteins, as well as the activity of ATP-dependent chromatin remodeling complexes. Choices B and C describe steps in transcription initiation, but do not accurately describe chromatin remodeling. Choice D refers to a specific type of DNA modification that can affect chromatin structure, but is not the same as chromatin remodeling. Choice E is incorrect, as mutations can affect DNA structure, but they do not necessarily involve chromatin remodeling.