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Questions and Answers
What structure is formed by the disassembly and reassembly of cytoplasmic microtubules during mitosis?
What structure is formed by the disassembly and reassembly of cytoplasmic microtubules during mitosis?
- Mitotic spindle (correct)
- Cytoplasmic network
- Actin filaments
- Microvilli
What role do microfilaments primarily play in the cell?
What role do microfilaments primarily play in the cell?
- Transportation of organelles
- Nutrient absorption
- Energy storage
- Bearing tension and providing mechanical strength (correct)
How are actin filaments linked together in the cytoskeleton?
How are actin filaments linked together in the cytoskeleton?
- By myosin proteins
- Using actin-binding proteins (correct)
- By tubulin dimers
- Through motor proteins
Which type of filament is primarily responsible for driving amoeboid movement?
Which type of filament is primarily responsible for driving amoeboid movement?
What is the diameter of microfilaments compared to microtubules?
What is the diameter of microfilaments compared to microtubules?
What is a primary function of intermediate filaments in cells?
What is a primary function of intermediate filaments in cells?
What is cytoplasmic streaming?
What is cytoplasmic streaming?
Which protein works alongside actin filaments to facilitate muscle contraction?
Which protein works alongside actin filaments to facilitate muscle contraction?
Which of the following describes a stable structural role of microfilaments?
Which of the following describes a stable structural role of microfilaments?
What diameter are microtubules typically?
What diameter are microtubules typically?
What is the primary structural function of intermediate filaments in cells?
What is the primary structural function of intermediate filaments in cells?
Where are intermediate filaments particularly abundant?
Where are intermediate filaments particularly abundant?
Which type of intermediate filament is specifically found in epithelial cells?
Which type of intermediate filament is specifically found in epithelial cells?
What condition is characterized by mutations in the keratin genes leading to fragile skin?
What condition is characterized by mutations in the keratin genes leading to fragile skin?
What is the function of the nuclear lamina?
What is the function of the nuclear lamina?
What is the approximate diameter range of intermediate filaments?
What is the approximate diameter range of intermediate filaments?
How do intermediate filaments contribute to cellular mechanical integrity?
How do intermediate filaments contribute to cellular mechanical integrity?
Which type of intermediate filament is primarily found in nerve cells?
Which type of intermediate filament is primarily found in nerve cells?
What role does the extracellular matrix (ECM) play in animal cells?
What role does the extracellular matrix (ECM) play in animal cells?
Which class of intermediate filaments is found in connective tissue and muscle cells?
Which class of intermediate filaments is found in connective tissue and muscle cells?
What is the primary role of microtubules in a eukaryotic cell?
What is the primary role of microtubules in a eukaryotic cell?
Which statement accurately describes microfilaments?
Which statement accurately describes microfilaments?
What is a key feature of the cytoskeleton?
What is a key feature of the cytoskeleton?
What is the diameter range of intermediate filaments?
What is the diameter range of intermediate filaments?
Which structure is responsible for the growth of microtubules in an animal cell?
Which structure is responsible for the growth of microtubules in an animal cell?
How do microtubules facilitate intracellular transport?
How do microtubules facilitate intracellular transport?
What role does the cytoskeleton play in relation to organelles?
What role does the cytoskeleton play in relation to organelles?
What is one of the functions of the cytoskeleton related to cell shape?
What is one of the functions of the cytoskeleton related to cell shape?
Which protein structures in the cytoskeleton are primarily responsible for vehicle transport?
Which protein structures in the cytoskeleton are primarily responsible for vehicle transport?
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Study Notes
Cytoskeleton
- A network of fibers that provides structure and support for the cell
- Interacts with motor proteins to move materials within the cell
- Composed of microtubules, microfilaments, and intermediate filaments
Microtubules
- Thickest component of the cytoskeleton
- Hollow tubes made of tubulin proteins
- Responsible for transporting organelles, vesicles, and other cell components
- Form mitotic spindles during cell division
- Important for cilia and flagella movement
Microfilaments
- Thinnest component of the cytoskeleton
- Solid rods made of actin proteins
- Provide tension resistance and support for the cell's shape
- Play a role in cell movement (amoeboid movement, cytoplasmic streaming)
- Involved in muscle contraction
Intermediate Filaments
- Fibers with diameters between microtubules and microfilaments
- Provide tensile strength to withstand stress
- Anchor to the plasma membrane at desmosomes
- Form the nuclear lamina, which strengthens the nuclear envelope
- Found in cells that experience a lot of mechanical stress (muscle cells, epithelial cells)
Extracellular Matrix (ECM)
- Provides structural and biochemical support for animal cells
- Found outside of the plasma membrane
- Plays a role in cell adhesion, migration, and development
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