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Introduction to the Cytoskeleton quiz #2 Flashcards

Introduction to the Cytoskeleton quiz #2
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  • Which of the following components do not play a role in intracellular movement: microfilaments, intermediate filaments, or microtubules?
    Intermediate filaments do not play a role in intracellular movement; they primarily provide structural support.
  • Bacterial cytoskeleton proteins share ancestry with which two eukaryotic proteins?
    Bacterial cytoskeleton proteins share ancestry with actin and tubulin, which are components of microfilaments and microtubules, respectively.
  • What is a microfilament?
    A microfilament is the smallest component of the cytoskeleton, composed of actin subunits, and is involved in cell movement and structure.
  • Which of the following is not considered to be a cytoskeletal element: microfilaments, intermediate filaments, microtubules, or ribosomes?
    Ribosomes are not considered to be a cytoskeletal element; they are involved in protein synthesis.
  • Which of the following functions is not associated with the cytoskeleton in eukaryotic cells: cell shape, DNA replication, intracellular transport, or cell movement?
    DNA replication is not associated with the cytoskeleton; it is primarily involved in cell shape, intracellular transport, and cell movement.
  • Which of the following is true of kinesin: it is a motor protein, it forms microfilaments, or it is involved in DNA replication?
    Kinesin is a motor protein that moves along microtubules to transport cellular cargo.
  • What are scaffolding proteins?
    Scaffolding proteins are proteins that help organize other proteins into complexes, facilitating cellular processes and signaling pathways.
  • What is the primary function of microtubules in cilia and flagella?
    Microtubules provide structural support and facilitate movement in cilia and flagella.
  • How do cilia and flagella differ in their structure and function?
    Cilia are short and numerous, moving like oars, while flagella are long and whip-like, primarily used for cell movement.
  • What is the dynamic nature of the cytoskeleton?
    The cytoskeleton is dynamic, meaning it can be rapidly assembled and disassembled to meet the cell's needs.
  • What is the cytoskeleton and what are its main functions in a eukaryotic cell?
    The cytoskeleton is a dynamic network of elongated proteins in the cytoplasm that provides cell shape, structure, movement, intracellular transport, and plays a role in cell signaling.
  • How do microfilaments, intermediate filaments, and microtubules differ in size?
    Microfilaments are the smallest, intermediate filaments are of medium size, and microtubules are the largest.
  • Which cytoskeletal component is the main structural element of cilia and flagella, and what is its significance?
    Microtubules are the main structural component of both cilia and flagella, making them essential for cell movement.
  • Explain how the cytoskeleton is involved in intracellular transport.
    The cytoskeleton provides tracks along which organelles and molecules can be transported within the cell, facilitating efficient intracellular movement.
  • Describe the composition and function of intermediate filaments.
    Intermediate filaments are composed of various proteins and provide mechanical strength and structural support to the cell.