Mid Lecture Quiz

Which of the following statements best describes chromatin remodeling?

• It increases the DNA sequence length

• It regulates gene expression by controlling DNA accessibility to transcription machinery

• It permanently changes the DNA sequence

• It removes histones from chromatin

Which of the following is an effect of high levels of DNA methylation at gene promoters?

• Increased gene expression

• No effect on gene expression

• Increased DNA replication rate

• Silencing of gene transcription

DNA methylation typically occurs at which type of site

• CpG sites

• CpA sites

• CpT sites

• AT-rich regions

Which enzyme is responsible for adding methyl groups to cytosines in DNA methylation?

• Histone methyltransferase

• • DNA methyltransferase

• Histone acetyltransferase

• RNA polymerase

What is the main effect of histone acetylation on chromatin structure?

• It condenses chromatin, making it inaccessible for transcription.

• It methylates the DNA, silencing gene expression.

• It loosens chromatin, allowing easier access for transcription factors.

• It removes histone proteins from the DNA.