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Questions and Answers
What is the primary role of actin in plant cells?
What is the primary role of actin in plant cells?
- Providing structural support to cellular projections
- Determining cell shape
- Long-distance transport of cytoplasmic vesicles and organelles (correct)
- Involved in various types of motility in cells
What is the size of actin filaments?
What is the size of actin filaments?
- Approximately 8 nm in diameter (correct)
- Approximately 10 nm in diameter
- Approximately 12 nm in diameter
- Approximately 6 nm in diameter
What is the role of actin in intracellular motile processes?
What is the role of actin in intracellular motile processes?
- Vesicle movement (correct)
- Cytokinesis
- Migration of neural crest cells in vertebrate embryos
- Providing structural support to cellular projections
What is the function of neurofilaments in neurons?
What is the function of neurofilaments in neurons?
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What is the composition of actin filaments?
What is the composition of actin filaments?
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What is the relationship between actin and human neurodegenerative disorders?
What is the relationship between actin and human neurodegenerative disorders?
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What is the major function of actin in muscle cells?
What is the major function of actin in muscle cells?
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What are the different ways actin filaments can be organized?
What are the different ways actin filaments can be organized?
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Study Notes
- Actin is a cytoskeletal element involved in various types of motility in cells.
- Actin is involved in the migration of neural crest cells in vertebrate embryos.
- Actin is also involved in intracellular motile processes such as vesicle movement and cytokinesis.
- Plant cells rely primarily on actin for long-distance transport of cytoplasmic vesicles and organelles.
- Actin plays a role in determining cell shape and providing structural support for cellular projections.
- The cytoplasm of neurons contains loosely packed bundles of intermediate filaments called neurofilaments.
- Aggregation of neurofilaments is seen in human neurodegenerative disorders such as ALS and Parkinson's disease.
- Actin filaments are composed of globular subunits of the protein actin and are approximately 8 nm in diameter.
- Actin filaments can be organized into ordered arrays, highly branched networks, or tightly anchored bundles.
- Actin was identified more than 50 years ago as one of the major contractile proteins of muscle cells and is a major protein in virtually every type of eukaryotic cell.
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