DNA Accessibility in Chromatin Structure
18 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What determines whether methylation promotes compaction or loosening of DNA?

  • The amount of methylation present
  • The presence of histones
  • The location of the DNA in the cell
  • The type of amino acid residue that is methylated (correct)
  • Which component of chromatin structure protrudes from the nucleosome?

  • DNA strands
  • Histone tails (correct)
  • Chromosomes
  • Telomeres
  • In which type of chromatin are the genes usually transcriptionally inactive?

  • Heterochromatin (correct)
  • Giemsa bands
  • Euchromatin
  • Histone tails
  • How many chromosomes do humans typically have?

    <p>23 chromosomes; 2 copies each</p> Signup and view all the answers

    Which dye is used to produce distinct patterns of G-bands on chromosomes?

    <p>Giemsa dye</p> Signup and view all the answers

    What term describes DNA that is tightly compacted and good for storage but not easy to access?

    <p>Heterochromatin</p> Signup and view all the answers

    What is the unit of measurement often used to quantify DNA?

    <p>Base pairs</p> Signup and view all the answers

    In eukaryotes, how is DNA compacted for storage and organization?

    <p>Compacted into chromatin</p> Signup and view all the answers

    What is the fundamental unit of chromatin called?

    <p>Nucleosome</p> Signup and view all the answers

    What proteins are involved in forming a nucleosome?

    <p>Histones H2A, H2B, H3, H4</p> Signup and view all the answers

    What is the purpose of the linker histone in a nucleosome?

    <p>Facilitate charge neutralization</p> Signup and view all the answers

    How is the compaction of DNA facilitated in eukaryotic cells?

    <p>By introducing positive charges to neutralize the negative charges on DNA</p> Signup and view all the answers

    What is the specific structure found at the tips of chromosomes?

    <p>Telomeres</p> Signup and view all the answers

    Which type of DNA is typically lost during replication?

    <p>Sacrificial DNA</p> Signup and view all the answers

    What structures help in anchoring the nucleus to the cytoskeleton?

    <p>Nuclear lamina</p> Signup and view all the answers

    What regulates the movement of proteins through nuclear pores?

    <p>Nuclear localization signals and nuclear export signals</p> Signup and view all the answers

    Which part of the nucleus maintains its shape through a fibrous protein network?

    <p>Nuclear matrix</p> Signup and view all the answers

    What lines the inner surface of the inner nuclear membrane?

    <p>Lamins</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Browser