Exploring DNA and Chromatin Regulation

What is the primary benefit of regulating gene expression at multiple steps?

• To conserve energy by expressing proteins only when needed

• To ensure all genes are always active

• To make the cell less adaptable

• To increase the number of proteins produced

What is chromatin primarily composed of?

• Lipids and carbohydrates

• DNA, histone proteins, and non-histone proteins

• RNA and proteins

• Only DNA

Which histone types are part of the nucleosome core?

• H1, H2A, H2B, H3

• H2A, H2B, H3, H4

• H1, H3, H4, H5

• H2A, H2B, H4, H5

What enzyme is responsible for adding acetyl groups to histones?

• Histone deacetylase

• DNA methyltransferase

• Histone acetyltransferase

• RNA polymerase

What effect does histone acetylation have on chromatin structure?

• It condenses the chromatin

• It uncoils the chromatin

• It degrades the chromatin

• It has no effect

What is the term for inheritable modifications that regulate gene expression?

• Genetic mutation

• Transcriptional regulation

• Epigenetic regulation

• Post-translational modification

Which type of chromatin is transcriptionally active?

• Heterochromatin

• Euchromatin

• Neither is active

• Both are equally active

What process involves the addition of a methyl group to DNA?

• Histone acetylation

• DNA methylation

• Protein phosphorylation

• RNA splicing

What is the role of methyl cpg-binding domain proteins (MBDs)?

• To acetylate histones

• To transcribe RNA

• To bind methylated DNA and recruit other proteins

• To degrade DNA

What is a potential consequence of abnormal DNA methylation?

• Improved cellular function

• Development of cancer

• Enhanced gene expression

• Increased protein synthesis