Cytoskeleton's Microfilaments Quiz
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Cytoskeleton's Microfilaments Quiz

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Questions and Answers

Which organelle regulates transport in the nucleus?

  • Centrioles
  • Nucleolus
  • Chromatin
  • Nuclear pores (correct)

    • What is the characteristic feature of steroid-secreting cells?

  • Prominent nucleolus
  • Microfilament focal adhesion sites
  • Tubulovesicular mitochondria (correct)
  • Condensed chromosomes

    • Which disease is caused by a mutation in lamin A?

  • Chromosome painting
  • Karyotyping
  • Cytochalasin B
  • Progeria (correct)

    • What technique examines condensed chromosomes during metaphase?

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

    Which cytoskeletal component aids in chromosome alignment and segregation during mitosis?

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

    What provides support to the plasma membrane in cell morphology?

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

    What cytoskeletal component is found in cilia and axonemes?

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

    What connects the nucleus to nuclear pores?

    <p>Intermediate filaments</p> Signup and view all the answers

    What is responsible for long-distance transport of vesicles and organelles?

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

    Which cytoskeletal component is depolymerized by cytochalasin B?

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

    Which type of cytoskeletal filament is composed of actin and is involved in cell motility and vesicle movement?

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

    What type of proteins connect actin to integrin receptors?

    <p>Actin-binding proteins (ABPs)</p> Signup and view all the answers

    Which cytoskeletal filament is composed of tubulin and acts as highways for vesicle and organelle movement?

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

    What is the function of intermediate filaments in the cell?

    <p>Anchor into the nucleus and periphery</p> Signup and view all the answers

    What is the function of the nucleolus?

    <p>Site of ribosomal subunit production, RNA, and protein synthesis</p> Signup and view all the answers

    What is the term for DNA wrapped around histone proteins?

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

    What region of the chromosome is responsible for the contact between sister chromatids?

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

    What is the function of nuclear pores?

    <p>Facilitate transport between nucleus and cytoplasm</p> Signup and view all the answers

    What is the term for the double unit membrane surrounding the nucleus?

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

    What type of proteins are kinesin and dynein?

    <p>Motor proteins for microtubule transport</p> Signup and view all the answers

    Study Notes

    Cellular Structure and Function

    • The nuclear pore complex regulates transport in and out of the nucleus.

    Cell Morphology and Cytoskeleton

    • Steroid-secreting cells have a characteristic feature of abundant smooth endoplasmic reticulum.
    • Mutations in lamin A can cause progeria, a premature aging disease.
    • The plasma membrane is supported by the cytoskeleton, specifically the spectrin network.

    Mitosis and Cytoskeleton

    • During metaphase, the karyotype technique examines condensed chromosomes.
    • Microtubules, a cytoskeletal component, aid in chromosome alignment and segregation during mitosis.

    Organelle Transport and Cytoskeleton

    • Dynein is responsible for long-distance transport of vesicles and organelles along microtubules.
    • Microtubules, composed of tubulin, act as highways for vesicle and organelle movement.

    Cytoskeletal Components and Functions

    • Cilia and axonemes contain the cytoskeletal component dynein.
    • Kinesin and dynein are motor proteins that connect microtubules to organelles and vesicles.
    • Actin filaments, composed of actin, are involved in cell motility and vesicle movement.
    • Integrins connect actin filaments to the extracellular matrix.

    Nucleus and Chromosomes

    • Intermediate filaments provide mechanical support and maintain cell shape.
    • The nucleolus is responsible for ribosome synthesis and assembly.
    • Chromatin is the term for DNA wrapped around histone proteins.
    • The centromere region is responsible for the contact between sister chromatids.
    • Nuclear pores allow for the bidirectional transport of molecules between the nucleus and cytoplasm.
    • The double unit membrane surrounding the nucleus is called the nuclear envelope.

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    Description

    Test your knowledge on the cytoskeleton's microfilaments and their role in cell motility, vesicle movement, and structural support. Learn about actin, actin-binding proteins, focal adhesion sites, and microvilli integration.

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