Skip to main content
Indietro

Eukaryotic Chromatin Modifications quiz #1

I pulsanti di controllo sono stati cambiati in modalità "navigazione".
1/16

Termini in questo insieme (16)

  • What is histone acetylation?
    Histone acetylation is the process of adding an acetyl group to histone proteins, which loosens chromatin structure and promotes euchromatin formation.
  • How does histone acetylation affect chromatin structure?
    Histone acetylation loosens the chromatin structure, making DNA more accessible to RNA polymerase and promoting transcription.
  • What is the role of histone tails in chromatin modification?
    Histone tails can be chemically modified by cellular enzymes, such as through acetylation, to regulate chromatin structure and gene expression.
  • What happens to chromatin structure during deacetylation?
    Deacetylation removes acetyl groups from histones, resulting in tighter chromatin packing and a heterochromatin state, which reduces transcription.
  • What is DNA methylation?
    DNA methylation is the addition of a methyl group to cytosine nucleotides, which typically blocks transcription by preventing RNA polymerase from accessing the promoter.
  • How does DNA methylation affect gene expression?
    DNA methylation turns off gene expression by blocking RNA polymerase from binding to the DNA, thus preventing transcription.
  • What is the difference between histone acetylation and DNA methylation?
    Histone acetylation promotes transcription by loosening chromatin, while DNA methylation inhibits transcription by blocking RNA polymerase access.
  • What are transcription factors?
    Transcription factors are proteins that bind to specific DNA sequences to regulate transcription initiation.
  • What is the role of general transcription factors?
    General transcription factors bind to the promoter region and are required for the transcription of all genes.
  • How do specific transcription factors differ from general transcription factors?
    Specific transcription factors bind to regulatory regions other than the promoter and are required for the transcription of specific genes.
  • What is the euchromatin state?
    Euchromatin is a loosely packed chromatin state that allows for active transcription.
  • What is the heterochromatin state?
    Heterochromatin is a tightly packed chromatin state that generally represses transcription.
  • What is the function of RNA polymerase in transcription?
    RNA polymerase binds to DNA and synthesizes RNA during transcription.
  • What is the effect of acetylation on gene expression?
    Acetylation increases gene expression by promoting a euchromatin state, making DNA more accessible for transcription.
  • What is the effect of methylation on gene expression?
    Methylation decreases gene expression by blocking RNA polymerase from accessing the DNA, thus preventing transcription.
  • What macromolecules compose eukaryotic chromatin?
    Eukaryotic chromatin is composed of DNA and histone proteins. DNA is wrapped around histone proteins to form nucleosomes, which are the basic units of chromatin.