Chromatin Structure & Cell Cycle Lecture Quiz
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Questions and Answers

What is the function of histone proteins in chromatin structure?

  • They play a role in DNA supercoiling and regulation of gene expression. (correct)
  • They are responsible for DNA replication in the cell nucleus.
  • They help in the formation of chromosomes during cell division.
  • They are involved in the production of non-histone proteins.

    • What is the structure of chromatin in non-dividing cells?

  • Formed of chromosomes before cell division.
  • Visible by light microscope as regularly beaded thread.
  • Not visible by light microscope but can be seen by electron microscope. (correct)
  • Composed of only histone proteins and non-histone proteins.

    • What are the components of each chromatid in chromatin structure?

  • Two DNA molecules and histone proteins.
  • Only histone proteins and non-histone proteins.
  • Multiple DNA molecules and nucleosomes.
  • A single DNA molecule, histone proteins, and non-histone proteins. (correct)

    • What is the length of DNA in each cell nucleus?

    <p>About 2m</p> Signup and view all the answers

    What role do histones play in chromatin structure?

    <p>Regulation of gene expression and DNA supercoiling.</p> Signup and view all the answers

    When does the chromatin form chromosomes?

    <p>Before cell division</p> Signup and view all the answers

    Which protein is attached to the linker DNA and facilitates the packing of nucleosomes into more compact structures?

    <p>H1</p> Signup and view all the answers

    How many histones form each nucleosome?

    <p>8 histones</p> Signup and view all the answers

    What is the function of linker or spacer DNA in the nucleosome structure?

    <p>Connects different nucleosomes like beads on a string</p> Signup and view all the answers

    What is the shape assumed by the tightly packed nucleosomes that form a nucleofilament?

    <p>30-nm fiber</p> Signup and view all the answers

    During which phase of the cell cycle does the DNA replicate to produce copies for both daughter cells?

    <p>S phase</p> Signup and view all the answers

    What happens in the G2 phase of the cell cycle?

    <p>New proteins are synthesized</p> Signup and view all the answers

    What is the waiting period known as, wherein each daughter cell divides again in embryonic or rapidly proliferating tissue?

    <p>G1 phase</p> Signup and view all the answers

    In which phase does cytokinesis pinch the cell in half, producing two daughter cells?

    <p>M phase</p> Signup and view all the answers

    What do differentiated cells that have acquired their specialized function and form do?

    <p>Remain in the G0 phase</p> Signup and view all the answers

    What do stem cells retain their potential to do?

    <p>Continue through another division</p> Signup and view all the answers

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